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  • Title: Giant Bicompartmental Cystic Tentorial Schwannoma Mimicking a Meningioma.
    Author: Kumar A, Singh M, Sharma MC, Chandra PS, Sharma BS, Mahapatra AK.
    Journal: World Neurosurg; 2017 Sep; 105():1038.e17-1038.e22. PubMed ID: 28642183.
    Abstract:
    BACKGROUND: Intracranial schwannomas most commonly arise from the vestibulocochlear nerve and less frequently from trigeminal, facial, and hypoglossal nerves. Intracranial schwannomas unrelated to cranial nerves are very rare; only approximately 50 cases have been reported in the literature. Tentorial schwannoma (TS) is even rarer, with only 13 cases reported to date. We present a rare case of giant TS. CASE DESCRIPTION: A 21-year-old man presented with generalized headache and dizziness for the past 6 months and worsening of symptoms for the past 2 months. On evaluation, he was found to have a cystic lesion arising from the right tentorium with multiple internal septa and fluid levels, with both supratentorial and infratentorial extension. The presence of a dural tail sign and tentorial origin led us to make a preoperative diagnosis of tentorial meningioma. The patient underwent complete excision, and a diagnosis of TS was made based on histopathologic analysis. CONCLUSIONS: TSs are extremely rare. Knowledge of radiologic and morphologic features can be helpful in making a preoperative diagnosis. The dural tail sign, which is considered a characteristic feature of meningioma, is commonly seen in TS as well, and thus TS should always be considered in the differential diagnosis of lesions arising from the tentorium.
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