this is a classic example
Butterfly glioma – name given to a high grade astrocytoma, usually a glioblastoma multiforme, which crosses the corpus callosum. The often symmetric projections extending out from the midline simulate butterfly wings. These tumors most frequently occur in the frontal lobes and like all high grade gliomas the prognosis is poor. Rarely cerebral metastases, tumefactive demyelination, lymphoma or cerebral toxoplasmosis may mimic this appearance.
from our tumblr blog