Pineal Germinoma With Granulomatous Reaction-Case Report-

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  • —Case Report—

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A 20-year-old man presented with diplopia. Neurological examination revealed mild skew deviation and upbeat nystagmus. Computed tomography showed a clover-shaped isodense mass in the pineal region with homogeneous enhancement. The lesion was isointense on both T1- and T2-weighted magnetic resonance (MR) imaging with homogeneous enhancement by gadolinium-diethylenetriaminepenta-acetic acid. Cerebral angiography showed no tumor staining. Serum and cerebrospinal fluid were negative for β-human chorionic gonadotropin, α-fetoprotein, and placental alkaline phosphatase. Open biopsy was performed using a right occipital transtentorial approach. Histological examination revealed a tumor consisting of clusters of germinoma cells, but with prominent infiltration of lymphocytes, plasma cells, and macrophages, and proliferation of small vessels. The histological diagnosis was germinoma with granulomatous reaction. MR imaging showed complete disappearance of the tumor after chemoradiotherapy. Neurosurgeons should be aware of this rare tumor to avoid misdiagnosis as granulomatous inflammation.<br>

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