Pilocytic astrocytoma

Case contributed by Dr Abdallah Al Khateeb


Ataxia, vomiting and papilledema.

Patient Data

Age: 20-month-old
Gender: Male

MRI Brain

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. 

Case Discussion

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.

PlayAdd to Share

Case information

rID: 45608
Published: 1st Jun 2016
Last edited: 23rd Nov 2019
Inclusion in quiz mode: Included

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.