Multiple Extracranial Metastases from a Rhabdoid Meningioma: A Case Report

Abstract

Meningiomas are among the most common intracranial primary tumors, and generally have a benign behavior. The incidence of extracranial metastasis of this pathology is low. There are different variants of them, with a wide variety of aggressiveness and potential to metastatic spread. Among the malignant meningiomas (1–3% of total), the rhabdoid variant is known for its aggressive biological and clinical behavior. It is also known that some histological subtypes are inherently prone to recur or spread, as the latter. In the latest World Health Organization classification, extracranial metastases are not currently considered a pathological criterion for malignancy, and, when present, they are most commonly found in the lung, liver, lymph nodes, and bone. Treatment is usually surgical resection of the metastases, but there is still no consensus about it. Owing to its poor prognosis, the rhabdoid subtype is commonly treated aggressively. Patients are submitted to local radiotherapy to prevent recurrence. Extracranial metastases of meningiomas are rare, but should always be remembered, especially in cases of local recurrence and malignant histology, as the rhabdoid variant. We report one case of extracranial metastases in a patient diagnosed with rhabdoid subtype of meningioma, and discuss the literature on this pathology.

Resumo

Meningiomas estão entre os tumores intracranianos primários mais comuns, e geralmente possuem comportamento benigno. A incidência de metástases extracranianas desta patologia é baixa. Existem diversas variantes, com uma ampla variedade de agressividade e potencial para disseminação metastática. Entre os meningiomas malignos (1–3% do total), a variante rabdoide é conhecida por seu comportamento agressivo clínico e biológico. Também é sabido que alguns subtipos histológicos são propensos à recidiva e disseminação, como o supracitado. Na última classificação da Organização Mundial de Saúde, metástases extracranianas não são consideradas como critério patológico para malignidade, e, quando presentes, são geralmente encontradas nos pulmões, fígado, linfonodos e ossos. O tratamento é geralmente a ressecção cirúrgica das metástases, embora não há consenso. Devido ao seu prognóstico pobre, o subtipo rabdoide é comumente tratado de forma agressiva. Os pacientes são submetidos à radioterapia local para prevenção de recidivas. As metástases extracranianas de meningiomas são raras, mas sempre devem ser consideradas, especialmente em casos com recidiva local e histologia maligna, como a variante rabdoide. Relatamos um caso de metástases extracranianas em um paciente com o subtipo rabdoide de meningioma, e discutimos a literatura a seu respeito.

Keywords

meningioma - metastatic meningioma - rhabdoid meningioma

Palavras-chave

meningioma - meningioma metastático - meningioma rabdoide

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