What differentiates pilocystic astrocytoma from medulloblastoma?
a) Pilocystic astrocytoma typically occurs in adults, while medulloblastoma occurs in children.
b) Pilocystic astrocytoma presents with calcifications, while medulloblastoma does not.
c) Pilocystic astrocytoma is a low-grade tumor, while medulloblastoma is high-grade.
d) Pilocystic astrocytoma arises in the cerebellum, while medulloblastoma arises in the cerebral hemispheres.