Thyroid & Adrenal
Pilocytic astrocytoma. All true except
|A||Seen in elderly above 80 yrs|
|B||Seen in posterior fossa|
|D||Most common tumor|
Pilocytic Astrocytoma Or Juvenile Pilocytic Astrocyt Oma Or Cystic Cerebellar Astrocytoma-
a. Brain tumor that occurs predominantly in children and involves the midline, basal, and posterior fossa structures.
b. It is in general considered as a Benign tumor of childhood and one of the most common variety.
c. This tumor has a noteworthy benign biological behavior that translates into high survival rate 94% at 10 yrs , that is by far the best of any glial tumor
d. It is often cystic and even if sometimes solid then it is well circumscribed
e. It is characteristically a Contrast enhancing tumor on CT and MRI.
f. Histologically composed of Bipolar cells with long Hair like GFAP positive processes. Rosenthal fibres, eosinophilic granular bodies and microcysts are often present
g. It is classified as Grade I Astrocytoma.