Congenital Nasopharyngeal Cysts: A Case Report

Background and Aim: Thornwaldt's cyst is an uncommon type of nasopharyngeal cyst that occurs as a result of abnormal embryological development at the posterior wall of the nasopharynx. They are usually asymptomatic but may cause clinically significant nasal symptoms.

Case Report: We present a case of a 37-year-old man who complained of nasal obstruction and persistent postnasal drip. Clinical examination revealed a smooth nasopharyngeal mass, which was completely obstructing the right and 70% of the left nasal choanae. Both CT and MRI scans revealed a smooth cystic mass, which did not invade the surrounding structures. Under general anesthesia the patient underwent transoral marsupialization of the cyst. Histopathological examination confirmed the diagnosis of Thornwaldt's cyst. Three months postoperatively the patient is free of symptoms and no recurrence has occurred.

Conclusion: Thornwaldt's cyst should he remembered as an uncommon but potentially treatable cause of symptoms seen in a typical otorhinolaryngology practice.