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Case 1: 48 yo female

CT Findings:

Low attenuation in left frontal white matter with possible extension into the corpus callosum consistent with vasogenic edema

No hemorrhage, calcification or obvious mass

MR Findings:

T2 white matter signal in the left frontal lobe due to edema

Cystic component

No enhancement

Case 1: 48 yo female

Oligodendroglioma

Typical location:

85% supratentorial; most commonly in frontal lobe

Involves subcortical white matter and cortex

Typical CT findings:

Mixed density

70-90% contain calcification

20% have cystic degeneration

Hemorrhage is uncommon

Case 1: 48 yo female

Typical MR findings:

Heterogeneous on T1 and T2 due to calcification and possible cystic change

May have very little edema

50% enhance

Typical PET findings:

FDG uptake is similar to that of normal white matter