Presentation
Reeling and wide-based gait
Patient Data
Enhancing mass in the posterior fossa. The fourth ventricle and left cerebellar peduncle are deviated to the right.
MRI reveals a left-sided posterior fossa extra-axial mass which demonstrates very low SI in T2 and FLAIR, mildly low SI on T1 and avidly enhancing post gad administration. The mass shows no restriction on DWI. The mass is broad-based on the left tentorium cerebelli and a small portion shows supratentorial extension. There is no vasogenic edema. The fourth ventricle and left cerebellar peduncle are deviated to the right. T2 hyperintense white matter foci are within normal limits for the patient's age.
Case Discussion
This patient underwent surgery. The mass was resected with a histopathological diagnosis of "fibrous solitary tumor". Pathology report referred to high cellularity proliferation, forming fascicules oriented at different directions, and occasionally intracellular collagen strips. There were no significant cellular atypia or mitoses. There was no necrosis. In some sections dura infiltration was seen. Immunohistological study showed: CD34+ , STAT6+, EMA- and PS100-.
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