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DOI: 10.1055/s-0042-1749675
The Female Genital Tract on MDCT: A Pictorial Review of Normal Anatomy and Incidental Abnormalities
- Introduction
- Normal Appearance of the Female Genital Tract on MDCT
- Incidentalomas of the Female Genital Tract
- Conclusion
- References
Abstract
Purpose This article aims to review the pertinent anatomy and the incidental abnormalities involving the female genital tract on multidetector computed tomography (MDCT) through a pictorial review.
Methods The review is based on critical analysis of the existing literature as well as our experience in dealing with incidental lesions involving the female genital tract.
Results The lack of awareness regarding the normal appearances of the female pelvis on MDCT can puzzle the inexperienced radiologist and create management dilemmas for the treating clinician. It is important for radiologists to recognize normal appearances of the female genital tract on MDCT to prevent misinterpretation as pathology. The identification of incidentalomas of the female genital tract on CT can further guide whether additional workup is required or not. This pictorial review familiarizes radiologists with the normal appearances of the female genital tract on MDCT and a few common incidentalomas.
Conclusion It is imperative for a clinical radiologist to be familiar with the anatomy and common incidental lesions involving the female genital tract.
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Introduction
Multidetector computed tomography (MDCT) has improved detection of incidental female genital tract abnormalities in both the oncology and nononcology patient population.[1] In emergent conditions, the pelvis is invariably scanned for evaluating nongynecological pelvic abnormalities on CT.[2]
A broad spectrum of anatomic variants and enhancement patterns of the uterus, cervix, and ovaries were unrecognized on CT previously.[2] Lack of awareness regarding the normal appearances of the female pelvic organs on contrast-enhanced CT (CECT) can puzzle the radiologist, who may mistake a normal finding as pathological, triggering additional imaging and causing unnecessary patient anxiety. Identification of disease of the female genital tract on CT is essential so that unsuspected, clinically important abnormalities are not misinterpreted, facilitating appropriate management.[3] These incidental abnormalities may or may not require serial follow-up imaging depending on the clinical setting. If the abnormalities cannot be completely characterized on CT, sonography and magnetic resonance imaging (MRI) can serve as problem-solving tools.[2]
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Normal Appearance of the Female Genital Tract on MDCT
Uterus
The uterus is often a forgotten organ on MDCT; however, it may harbor significant pathology. A second look using intravenous contrast and multiplanar reconstructions is a must to confidently rule out pathologies.[4] [5]
On CT, the endometrium is identified as the central hypoattenuating region in the uterus, with its shape classified as tubular or triangular.[1] The endometrium and the endometrial cavity are often a source of confusion on CECT.[2] Axial and coronal planes overestimate the endometrial thickness especially if the uterus is anteverted or retroverted, as the endometrium is imaged in an oblique plane in such scenarios.[2] A sagittal scan facilitates accurate and true estimation of the endometrial thickness[2] ([Fig. 1]). CT is an insensitive technique for detecting mild endometrial thickening in both pre- and postmenopausal females.[1] The differentiation of endometrial thickening from endometrial fluid cannot be made on the current CT technology and transvaginal sonography remains the modality of choice for this purpose[1] ([Fig. 2]).
In a study performed by Lim et al,[6] the upper limit of the short-axis endometrial thickness in an asymptomatic postmenopausal female was 12 mm in the sagittal plane which was slightly higher than the 8-mm parameter used for ultrasound. This difference is a consequence of the difference in imaging planes between the two modalities.
In a study performed by Yitta et al,[2] three subtypes of uterine and cervical enhancement were described ([Fig. 3]):
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Type 1: thick or thin subendometrial band-like enhancement with or without outer myometrial enhancement observed at 30 to 120 seconds after contrast injection, predominantly in premenopausal women ([Fig. 4A–C]).
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Type 2: enhancement progressing from the outer myometrial region to the entire myometrium or diffuse from the onset, without any defined subendometrial enhancement, observed equally in pre- and postmenopausal women ([Fig. 4D]).
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Type 3: faint diffuse myometrial enhancement, observed exclusively in postmenopausal women ([Fig. 4E]).
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A fourth type of pattern of enhancement, patchy heterogeneous enhancement was also reported by Yitta et al[2] ([Fig. 4F]).
The pattern of enhancement is affected by the timing of contrast injection and cardiac output.[2] The type 1 pattern of enhancement is transitory and progresses to type 3 on delayed imaging[2] ([Fig. 5]).
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Cervix
The cervix appears hypoattenuating ([Fig. 6]) with respect to the uterus as a consequence of the greater amount of fibrous tissue in its stroma and may show delayed enhancement, which may masquerade as a cervical mass.[2] The demonstration of contiguity of the endocervical canal with the endometrial canal on multiplanar reconstructions helps in the identification of a normal cervix.[2] The zonal enhancement of the cervix is typically characterized by intense central circumferential enhancement (due to the richly glandular central mucosa) with less intense enhancement of the surrounding inner fibromuscular stroma.[2] The outermost fibromuscular stromal region enhances more markedly than the inner fibromuscular stroma but less markedly than the central cervical mucosa.[2] The combination of these three layers produces a “target-like” appearance of the cervix ([Fig. 7]) on axial images.[2]
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Vagina
The vagina is often overlooked in cross-sectional examinations of the pelvis. Even though CT is not the primary modality to evaluate the vagina, it is important to be aware of its normal appearance on CT. The appearance of the vagina varies depending on the hormonal influence.[7] In females of reproductive age, the vaginal mucosa enhances brightly, whereas the vaginal wall is hypoattenuating relative to the mucosa and cannot be distinguished from the adjacent pelvic structures (urethra anteriorly, anterior rectal wall posteriorly).[7] The intense central vaginal enhancement corresponding to vaginal mucosa ([Fig. 8]) can be differentiated from the poorly enhancing vaginal wall.[2] In postmenopausal women, the vaginal mucosa is hypoenhancing, similar to the vaginal wall and adjacent structures.[7]
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Ovaries
The normal ovaries do not enhance significantly.[8] On CECT, the ovary enhances less than the myometrium. The appearance of the ovaries also varies with the hormonal status of females. In the females of reproductive age group, the ovaries can have a variable appearance and may show fluid or soft tissue attenuation[8] or multiple follicles ([Fig. 9]). In postmenopausal women, the ovaries are small and featureless with homogenous soft tissue attenuation.[8]
The maximum linear dimension of the ovary is 5 cm for premenopausal women and 3 to 4 cm for postmenopausal women[8]; while the volume is up to 20 and 10 cm3, respectively.[9] However, in the presence of a physiologic ovarian cyst in a premenopausal patient, the ovarian size can increase up to 7 cm in length.[8]
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Fallopian Tubes
The normal fallopian tubes are not visualized on CT unless they are dilated with fluid, pus, or blood.[10] The identification of a well-visualized or dilated fallopian tube should prompt the radiologist to look for the underlying cause pathology. The normal fallopian tubes, however, may sometimes be seen in the presence of ascites.
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Lymph Nodes
The incidental finding of prominent pelvic lymph nodes, particularly on coronal reformatted CT images, has become more common with improved scanning techniques.[1] A normal lymph node has a bean-shaped morphology with a fatty hilum. Pathological lymph nodes need to be differentiated from nonpathological ones, and are more likely to have an irregular border and are more likely to be round than oval, with a short-to-long axis ratio of 0.81, compared with 0.57 for benign nodes.[1] The preservation of a normal fatty hilum indicates a benign node, whereas central necrosis can be seen with metastatic involvement. There is a lack of consensus regarding the normal size limit in the diagnosis of pelvic tumor nodal metastases, although a threshold of 8 mm short-axis diameter is used for pelvic lymph nodes.[1]
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Incidentalomas of the Female Genital Tract
Uterocervical Incidentalomas
Uterine Fibroids
Fibroids are the most common pelvic tumor found incidentally on CT. These can be small or giant, homogeneous or inhomogeneous, pelvic or abdomino-pelvic masses.[11] An enlarged uterus with deformed uterine contour is the most common CT finding.[12] Minimal uterine enlargement is difficult to detect on CT; therefore, uterine size alone is not a useful criterion for diagnosing fibroids.[12] Fibroids presenting as alterations in contour or lobulations ([Fig. 10]) are identified more often in the uterine fundus than the body.[12]
They can appear hypoattenuating, isoattenuating, or hyperattenuating with respect to the normal uterus on MDCT.[2] Calcification or cystic changes may be seen within large masses.[12] The presence of calcification in a uterine mass ([Fig. 11]) is the most specific sign of a leiomyoma.[12] However, this finding is reportedly uncommon. The dystrophic calcification of solid mass type usually has a mottled appearance with no well-defined curvilinear rim. In multiple uterine leiomyomas, calcification may be present in only one of the tumors or limited to only a part of the tumor.[12] Necrosis or degeneration may be seen on CT scans as a low-attenuation within the fibroid. Areas of high attenuation can be seen in atypical leiomyomas.[12] In infected fibroids, the central core can get filled with purulent material or gas.[12]
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Postpartum Uterus
Women may undergo MDCT because of vague abdominal pain, unexplained fever, suspicion of appendicitis, etc. in the postpartum period. The uterus in such patients may be mistaken as abnormal if the patient's clinical history is unknown and the radiologist is unfamiliar with imaging appearance of the postpartum uterus.
Typically, a postpartum uterus is enlarged and boggy, with distension of the endometrial canal which may persist until approximately 6 to 8 weeks. Intrauterine air is normal up to 3 weeks postpartum in the absence of clinical signs of infection.[2] The former site of placental attachment may normally demonstrate a myometrial defect with increased vascularity and enhancement, and this should not be mistaken for more grave pathologies ([Fig. 12]). In addition, prominent vessels may be seen within the myometrium normally in the postpartum period ([Fig. 13]).[2]
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Post-Caesarean Section Appearances
Caesarean section is a commonly performed surgical procedure in women. The surgical incision line in the uterus is generally located in the lower segment of the anterior uterine wall. Acquaintance with the normal and abnormal findings of the anterior uterine wall is of critical importance for radiologists in this era of ever-increasing caesarean sections.[13] An oval or triangular area of hypoattenuation, which represents edema, can be seen in the myometrium in the anterior lower uterine segment[5] ([Fig. 14]). Myometrial discontinuity on CT in the first postpartum week should not be interpreted as uterine rupture or dehiscence.[2] Postpartum uterine discontinuity even in the presence of endometrial or parametrial air and intraperitoneal free air are normal findings after caesarean section.[2] Thus, the radiologist must be extremely cautious in diagnosing uterine dehiscence and rule out its mimics.
The uterine cavity is usually empty after a caesarean section and there should not be significant free fluid in the pelvis in the absence of peritoneal irrigation.[5] The low transverse incision site is best visualized on the sagittal reconstruction and the vertical incision site is best visualized on axial sections. A small hematoma which appears hyperechoic on ultrasonography and a high-attenuation on CT may be seen at the uterine incision site or the prevesical space.[5] The imaging findings should always be interpreted along with the clinical findings of the patient.[5]
Endometrial clot and debris appear as hyperattenuating material on CT. These findings can be seen in healthy patients but are also common findings in the setting of endometritis, making the patient's clinical history extremely important for proper image interpretation. Small amounts of air in the subcutaneous incision, the endometrium, and the urinary bladder (from a Foley catheter) are also routine findings after caesarean delivery.[5] Haziness and stranding or small areas of fluid in the subcutaneous fat can be visualized due to the surgical procedure. However, a discrete, walled-off fluid collection suggestive of an abscess is abnormal and needs to be reported. Small peritoneal fluid collections such as anterior subfascial hematomas and bladder flap hematomas are generally considered normal and are usually not clinically significant if less than 4 cm in size.[13]
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Healed Caesarean Scar
A healed cesarean scar appears as a narrow transverse line in the anterior lower uterine segment, best evaluated in the sagittal section.[13] At the level of the scar, thinning and retraction of the anterior myometrium creates wedge-shaped defects which causes distortion of the tissues adjacent to the scar and may give “hourglass” shape on sagittal views.[13]
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Nabothian Cysts
On MDCT, nabothian cysts may be visualized as well-defined, variable-sized lesions in the cervix showing an attenuation similar to that of fluid (10–15 Hounsfield unit [HU]) ([Fig. 10]). At axial imaging, a centrally located nabothian cyst may mimic a fluid-filled distended endocervical canal. A dilated endocervical canal needs to be differentiated from the nabothian cysts, which appear as thin-walled, rounded structures ([Fig. 15]). They appear separate from the endocervical canal which is distinguished by its enhancing mucosa.[2] Nabothian cysts must be identified correctly because no treatment is required if they are asymptomatic. On sonography most nabothian cysts appear as simple anechoic cysts in the cervix, without vascularity.[2] However, they may vary in appearance because of proteinaceous or hemorrhagic content, clustering of adjacent cysts, and deep extension into the cervical stroma, sometimes enlarging the cervix.[2] The “tunnel cluster” variant of nabothian cyst appears as a complex multicystic cervical mass that may mimic cervical malignancy and this differentiation is critical.[2]
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Adnexal Lesions
Physiological Cysts
Follicular cysts are the most common well-defined adnexal masses. On CT, they appear as a sharply marginated, round, simple fluid collections (attenuation < 20 HU) with a thin nonenhancing wall. When found incidentally on CT, follow-up ultrasound should be done after one to two menstrual cycles as they usually resolve within 4 to 8 weeks.[9] A dominant follicle is differentiated from simple cysts on basis of size being < 2.5 cm ([Fig. 16]). Corpus luteal cysts are ovarian cysts which arise following rupture of a Graafian follicle. They have thick and crenulated walls that may show enhancement ([Fig. 17]).
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Hemorrhagic Cysts
On noncontrast CT, hemorrhagic cysts can appear as unilocular cystic lesions with a density ranging from 25 to 100 HU ([Fig. 18]).[14] In cases where rupture occurs, fluid–fluid levels and hemoperitoneum can be demonstrated. The identification of hemorrhagic cysts on CT does not need immediate sonographic evaluation unless there is significant hemoperitoneum.[14] A follow-up ultrasound after two to three menstrual cycles will demonstrate change in internal echotexture and resolution of the cyst.[14] There exists considerable overlap between the imaging appearances of hemorrhagic and luteal cysts, and the wall of corpus luteal cysts appears thicker than that of follicular cyst on the postcontrast study.[10]
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Dermoid Cyst
Dermoid cysts are the most common germ cell neoplasm and also the most common germ cell neoplasm resected during surgery.[15] Approximately 85% are detected between the ages of 20 and 50 years and most of them are mature and benign, with 99% showing a cystic component. Roughly 3% of these lesions will eventually undergo torsion.[9] CT demonstrates macroscopic fat in more than 90% of ovarian dermoids ([Fig. 19]). Fat attenuation within a cystic ovarian lesion with or without wall calcification is diagnostic for dermoid cyst.[15] A floating mass of hair can sometimes be detected at the fat–fluid interface on CT.[15] Mural nodules, calcification, and teeth are also depicted on MDCT. The complications of dermoid cysts include torsion, rupture, and malignant degeneration. Malignant transformation of mature cystic teratoma is a rare complication which is reported to occur in 1 to 2% of cases.[15] The appearance of a solid enhancing component within the dermoid cyst should prompt consideration of malignant degeneration and this usually occurs in 6th to 7th decade.[15] Although there is debate regarding their management, most clinicians recommend surgical intervention in symptomatic, large (> 5 cm), and potentially malignant cysts.[16]
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Theca Lutein Cysts
These may be identified as bilateral, symmetrical, large, multilocular adnexal cystic masses ([Fig. 20]) in patients on ovulation induction therapy. They may also be incidentally observed following evacuation of a molar pregnancy for 2 to 4 months.
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Metastatic Disease to the Ovaries
Five to 20% of ovarian malignancies are metastases and in up to 38% of cases, the identification of metastasis precedes the primary neoplasm.[1] Metastases to the ovaries may occur hematogenously, via direct extension, or by peritoneal spread. Most studies have shown that differentiation between metastatic and primary tumors on the basis of imaging findings alone is difficult. Clinical context can help. Metastases typically are solid, bilateral ([Fig. 21]), and strongly enhancing. Cystic and necrotic areas are common, and lesions which are predominantly cystic may resemble primary ovarian cancer.
The American College of Radiology Incidental Findings Committee have updated the recommendations for managing adnexal masses incidentally detected on CT and MRI on the basis of menstrual status or age of the patient with the goal of improving the quality of patient care.[17] Patel et al[17] organized the adnexal masses into (1) a simple appearing cyst, (2) cyst with reasonably diagnostic imaging features (benign examples include some hemorrhagic, corpus luteal cysts, peritoneal inclusion cysts, endometriomas, dermoids, etc.), which may be followed up between 6 and 12 months, if required, and (3) a mass with uncertain diagnosis (which need sonography/contrast-enhanced MR for further characterization). The “simple-appearing cyst” is a round or ovoid fluid density mass (–10 to 20 HU) on CT without a solid component, with smooth, imperceptible, or thin walls; they have a very low risk of malignancy. Sonographic characterization of incidental simple-appearing cysts on CT > 3 cm (postmenopausal) or > 5 cm (premenopausal) is justified because the likelihood of CT mischaracterization may be higher. Adnexal calcification in the absence of a mass is inconsequential.[17]
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Incidental Dilatation of Pelvic Vessels
Diffuse or focal dilation of the pelvic vessels can be incidentally visualized in patients with abdomino-pelvic neoplasms on MDCT. There are two major processes accounting for this vascular dilation.[1] It may be due to increased blood flow through collateral vessels associated with neoplasms such as gestational trophoblastic disease, ovarian solid tumors, etc. The other mechanism causing dilated collateral channels is benign or malignant venous obstruction or stenosis ([Fig. 22]), portal hypertension, and left renal venous compression between the aorta and superior mesenteric artery causing left gonadal vein dilatation. The assessment of such vessels can assist in identification of tumor origins.[18]
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Neurofibromas
CECT may reveal multiple, soft tissue density, well defined, fusiform/oval conglomerated lesions along the course of the sacral nerves which cause enlargement of the neural foramina through which they exit ([Fig. 23]). Neurofibromas should not be mistaken for pelvic lymphadenopathy.
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Procidentia
Like MR, MDCT can demonstrate simple or complex organ descent ([Fig. 24]) in all pelvic compartments and facilitate comprehensive planning by the surgeon; thus, increasing the success rate of the surgical intervention.
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Conclusion
Incidental diseases of the female genital tract are inevitably uncovered with increasing frequency due to technical improvements in cross-sectional imaging. It is important for radiologists to recognize normal appearances of the female genital tract on MDCT to prevent misinterpretation as pathology. To avoid overdiagnosing incidental pelvic lesions that could have a negative effect on overall patient care, radiologists should use clinical correlation to decide when reimaging the pelvis with ultrasound or MRI is indicated, for further characterization of abnormal CT findings.
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Conflict of Interest
None declared.
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References
- 1 Gore RM, Newmark GM, Thakrar KH, Mehta UK, Berlin JW. Pelvic incidentalomas. Cancer Imaging 2010; 10 Spec no A: S15-S26
- 2 Yitta S, Hecht EM, Mausner EV, Bennett GL. Normal or abnormal? Demystifying uterine and cervical contrast enhancement at multidetector CT. Radiographics 2011; 31 (03) 647-661
- 3 Gulati S, Rathi V, Jain S, Bhatt S. Incidentalomas of the female genital tract on 64-slice MDCT: a clinico-radiological pictorial review. Abdom Radiol (NY) 2021; 46 (09) 4420-4431
- 4 Harvie M, Soin S, Sahu A. Don't be hysterical … a pictorial review of the uterus as seen with CT. Clin Radiol 2019; 74: e14
- 5 Rodgers SK, Kirby CL, Smith RJ, Horrow MM. Imaging after cesarean delivery: acute and chronic complications. Radiographics 2012; 32 (06) 1693-1712
- 6 Lim PS, Nazarian LN, Wechsler RJ, Kurtz AB, Parker L. The endometrium on routine contrast-enhanced CT in asymptomatic postmenopausal women: avoiding errors in interpretation. Clin Imaging 2002; 26 (05) 325-329
- 7 Walker DK, Salibian RA, Salibian AD, Belen KM, Palmer SL. Overlooked diseases of the vagina: a directed anatomic-pathologic approach for imaging assessment. Radiographics 2011; 31 (06) 1583-1598
- 8 Saksouk FA, Johnson SC. Recognition of the ovaries and ovarian origin of pelvic masses with CT. Radiographics 2004; 24 (01, Suppl 1): S133-S146
- 9 Patel MD, Ascher SM, Paspulati RM. et al. Managing incidental findings on abdominal and pelvic CT and MRI, part 1: white paper of the ACR Incidental Findings Committee II on adnexal findings. J Am Coll Radiol 2013; 10 (09) 675-681
- 10 Tonolini M, Foti PV, Costanzo V. et al. Cross-sectional imaging of acute gynaecologic disorders: CT and MRI findings with differential diagnosis-part I: corpus luteum and haemorrhagic ovarian cysts, genital causes of haemoperitoneum and adnexal torsion. Insights Imaging 2019; 10 (01) 119
- 11 Gross BH, Moss AA, Mihara K, Goldberg HI, Glazer GM. Computed tomography of gynecologic diseases. AJR Am J Roentgenol 1983; 141 (04) 765-773
- 12 Tada S, Tsukioka M, Ishii C, Tanaka H, Mizunuma K. Computed tomographic features of uterine myoma. J Comput Assist Tomogr 1981; 5 (06) 866-869
- 13 Karaosmanoğlu AD, Güneş A, Özmen MN, Akata D. Anterior uterine wall: normal and abnormal CT and MRI findings after cesarean section. Diagn Interv Radiol 2018; 24 (03) 135-138
- 14 Potter AW, Chandrasekhar CA. US and CT evaluation of acute pelvic pain of gynecologic origin in nonpregnant premenopausal patients. Radiographics 2008; 28 (06) 1645-1659
- 15 Outwater EK, Siegelman ES, Hunt JL. Ovarian teratomas: tumor types and imaging characteristics. Radiographics 2001; 21 (02) 475-490
- 16 O'Neill KE, Cooper AR. The approach to ovarian dermoids in adolescents and young women. J Pediatr Adolesc Gynecol 2011; 24 (03) 176-180
- 17 Patel MD, Ascher AR, Horrow MM, Pickhardt PJ, Poder L, Goldman M, Berland LL, Pandharipande PV, Maturen KK. Management of Incidental Adnexal Findings on CT and MRI: A White Paper of the ACR Incidental Findings Committee. J Am Coll Radiol 2020; Feb 17 (02) 248-254
- 18 Vascular Dilatation in the Pelvis. Identification with CT and MR Imaging | RadioGraphics. Accessed May 7, 2021 at: https://pubs.rsna.org/doi/full/10.1148/rg.241035061
Address for correspondence
Publication History
Article published online:
15 August 2022
© 2022. Indian Society of Gastrointestinal and Abdominal Radiology. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)
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References
- 1 Gore RM, Newmark GM, Thakrar KH, Mehta UK, Berlin JW. Pelvic incidentalomas. Cancer Imaging 2010; 10 Spec no A: S15-S26
- 2 Yitta S, Hecht EM, Mausner EV, Bennett GL. Normal or abnormal? Demystifying uterine and cervical contrast enhancement at multidetector CT. Radiographics 2011; 31 (03) 647-661
- 3 Gulati S, Rathi V, Jain S, Bhatt S. Incidentalomas of the female genital tract on 64-slice MDCT: a clinico-radiological pictorial review. Abdom Radiol (NY) 2021; 46 (09) 4420-4431
- 4 Harvie M, Soin S, Sahu A. Don't be hysterical … a pictorial review of the uterus as seen with CT. Clin Radiol 2019; 74: e14
- 5 Rodgers SK, Kirby CL, Smith RJ, Horrow MM. Imaging after cesarean delivery: acute and chronic complications. Radiographics 2012; 32 (06) 1693-1712
- 6 Lim PS, Nazarian LN, Wechsler RJ, Kurtz AB, Parker L. The endometrium on routine contrast-enhanced CT in asymptomatic postmenopausal women: avoiding errors in interpretation. Clin Imaging 2002; 26 (05) 325-329
- 7 Walker DK, Salibian RA, Salibian AD, Belen KM, Palmer SL. Overlooked diseases of the vagina: a directed anatomic-pathologic approach for imaging assessment. Radiographics 2011; 31 (06) 1583-1598
- 8 Saksouk FA, Johnson SC. Recognition of the ovaries and ovarian origin of pelvic masses with CT. Radiographics 2004; 24 (01, Suppl 1): S133-S146
- 9 Patel MD, Ascher SM, Paspulati RM. et al. Managing incidental findings on abdominal and pelvic CT and MRI, part 1: white paper of the ACR Incidental Findings Committee II on adnexal findings. J Am Coll Radiol 2013; 10 (09) 675-681
- 10 Tonolini M, Foti PV, Costanzo V. et al. Cross-sectional imaging of acute gynaecologic disorders: CT and MRI findings with differential diagnosis-part I: corpus luteum and haemorrhagic ovarian cysts, genital causes of haemoperitoneum and adnexal torsion. Insights Imaging 2019; 10 (01) 119
- 11 Gross BH, Moss AA, Mihara K, Goldberg HI, Glazer GM. Computed tomography of gynecologic diseases. AJR Am J Roentgenol 1983; 141 (04) 765-773
- 12 Tada S, Tsukioka M, Ishii C, Tanaka H, Mizunuma K. Computed tomographic features of uterine myoma. J Comput Assist Tomogr 1981; 5 (06) 866-869
- 13 Karaosmanoğlu AD, Güneş A, Özmen MN, Akata D. Anterior uterine wall: normal and abnormal CT and MRI findings after cesarean section. Diagn Interv Radiol 2018; 24 (03) 135-138
- 14 Potter AW, Chandrasekhar CA. US and CT evaluation of acute pelvic pain of gynecologic origin in nonpregnant premenopausal patients. Radiographics 2008; 28 (06) 1645-1659
- 15 Outwater EK, Siegelman ES, Hunt JL. Ovarian teratomas: tumor types and imaging characteristics. Radiographics 2001; 21 (02) 475-490
- 16 O'Neill KE, Cooper AR. The approach to ovarian dermoids in adolescents and young women. J Pediatr Adolesc Gynecol 2011; 24 (03) 176-180
- 17 Patel MD, Ascher AR, Horrow MM, Pickhardt PJ, Poder L, Goldman M, Berland LL, Pandharipande PV, Maturen KK. Management of Incidental Adnexal Findings on CT and MRI: A White Paper of the ACR Incidental Findings Committee. J Am Coll Radiol 2020; Feb 17 (02) 248-254
- 18 Vascular Dilatation in the Pelvis. Identification with CT and MR Imaging | RadioGraphics. Accessed May 7, 2021 at: https://pubs.rsna.org/doi/full/10.1148/rg.241035061