MYC and brain infarction: Initial MRI brain: multifocal acute and subacute infarcts; initial MRI spine: noncontributory; repeat MRI brain and spine: new cerebral infarction and new spinal infarction at T6-7; CTAP: splenomegaly; cerebral angiogram: negative; bone marrow biopsy: elevated plasma cells of normal morphology and normal flow cytometry; brain biopsy: consistent with "double expressor" (MYC and BCL2) nongerminal center IVL