Bone marrow lymphoma. There is a heterogeneous appearance of the calvarial bone marrow. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma and pituitary gland appear unremarkable. There is no abnormal intracranial enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits are grossly unremarkable. There are a few small retention cysts in the bilateral maxillary sinuses.
1. A heterogeneous appearance of the calvarial bone marrow is compatible with lymphoma.2. No evidence of intracranial mass. 