Medulloblastoma

Case contributed by Khairy Abdella
Diagnosis almost certain

Presentation

Headache

Patient Data

Age: 5 years
Gender: Female
mri

A large posterior fossa solid mass that occupies and expands 4th ventricle measures about 4 x 3.2 x 4.7 cm in its various dimensions. It shows hypointense signal at T1WI, heterogeneous bright signal at T2WI, showing cystic areas of degeneration, and restricted diffusion in DWI. It is bulging through foramen of Magendie. It is associated with moderate supratentorial hydrocephalus with periventricular CSF transependymal permeation and surrounded by mild cerebellar edema.

Case Discussion

Medulloblastoma is the most common brain tumor in childhood. It occurs mainly in the posterior fossa and associated with obstructive hydrocephalus. Differentiating medulloblastoma from posterior fossa ependymoma is one of the radiological challenges, especially in the pediatric age group.

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