The patient underwent surgical resection of the tumor.

HISTOPATHOLOGY

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.