Neuroepithelial cysts of the posterior fossa

Case report

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✓ The authors report the case of a patient harboring a posterior fossa neuroepithelial cyst who presented with positional facial weakness and syncope. The patient recovered rapidly after cyst fenestration and placement of an internal cyst-cisternal shunt. The pathogenesis and principles of diagnosis and management of these rare lesions are reviewed.

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Figures

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    Coronal and axial T1-weighted magnetic resonance images demonstrating a 3-cm cyst in the region of the right cerebellopontine angle. The cyst displaces the seventh-eighth cranial nerve complex superiorly (single arrow) and the jugular foramen complex inferiorly (arrowhead). The extra-axial fluid collection is isointense with cerebrospinal fluid on both T1 and T2-weighted images.

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    Follow-up magnetic resonance images 4 months postoperatively showing interval decrease in cyst size (arrow). Brain-stem compression is no longer present.

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    Photomicrograph of the cyst wall showing connective-tissue stroma lined by cuboidal epithelium resembling ependyma. H & E, × 100.

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