Calvarial plasmablastic lymphoma. [Neuroradiology] [CT] [MR]

41 year old male with history of HIV-AIDS, meth-abuse, presents with progressive headache and confusion over days.

CT shows a large mass destroying the left frontoparietal calvarium and causing significant mass effect on the underlying brain.

MR shows a heterogeneous enhancing mass with hemorrhage (SWI - dark areas), hypercellularity (DWI - mildly bright areas), and hyperperfusion (ASL - bright areas), features suspicious for high-grade tumor.