• World Neurosurg · Sep 2018

    Case Reports

    Rare Case of Convexity Meningioma Growing into Arachnoid Cyst.

    • David B Schul, Michael P Meier, Zsuzsanna Földvari, Matthias J Krammer, and Christianto B Lumenta.
    • Department of Neurosurgery, Bogenhausen Academic Teaching Hospital, Technical University of Munich, Munich, Germany. Electronic address: dudischul@gmail.com.
    • World Neurosurg. 2018 Sep 1; 117: 199-202.

    BackgroundMeningioma growing into an arachnoid cyst is an extremely rare event. Only 3 cases are reported in the literature. In 2 of them, an operative procedure in or near the arachnoid cyst preceded tumor growth.Case DescriptionWe report a case of a patient requiring marsupialization of an arachnoid cyst of the middle cranial fossa. On follow-up, 3 years postoperatively he showed no signs of recurrence or tumor growth. One year later, the fourth year after surgery on the cyst, he presented with large tumor growth into the former cyst's cavity. Pathologic workup after resection revealed an atypical meningioma (World Health Organization grade II).ConclusionsWe discuss the possible pathogenesis in light of the scarce published literature, as well as the differential diagnosis of this rapidly growing tumor.Copyright © 2018 Elsevier Inc. All rights reserved.

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