Ataxia, vomiting and papilledema.
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Large cystic mass at the right posterior fossa with peripheral thick nodular enhancement.
Significant mass effect on the cerebellum and the fourth ventricle, crowded foramen magnum, signs of obstructive hydrocephalus and trans ependymal edema.
The patient underwent surgical resection of the tumor.
Microscopic description: Bi-phasic growth pattern of alternating microcystic and more compact cellular areas. The cells exhibit hair-like processes embedded in a fibrillary background. No evidence of atypia, nuclear pleomorphism, necrosis or increased mitosis is seen. Those glial cells are strongly positive for GFAP immunostatins, Ki-67 proliferative index is estimated at 3%.
Diagnosis: Pilocytic astrocytoma - WHO grade I.