Posterior fossa pilocytic astrocytoma
Case contributed by:
Dr Maxime St-Amant
Presentation:
Cerebellar symptoms.
Patient Data:
Age: 5
Gender: Male
Race: Caucasian
From the case:
Posterior fossa pilocytic astrocytoma
Modality:
MRI
Posterior fossa mass containing cystic foci either originating from the fourth ventricles or invading it secondarily, responsible for obstructive hydrocephalus with transependymal resorption.
The differential diagnosis for this lesion includes ependymoma, medulloblastoma and pilocytic astrocytoma. A rarer tumor, atypical teratoid rhabdoid tumor (AT/RT) can also have this appearance.
Case Discussion:
The pathologic diagnosis for this tumor was pilocytic astrocytoma.
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