54 years, Male, Reason: f/u brain lesions History: brain lesions. History of leukemia and intracranial abscess. Compared to 6/18/2015, there is been marked improvement/resolution of the previously seen peripherally enhancing lesion with restricted diffusion within the left cerebellar hemisphere. Again seen is leptomeningeal enhancement involving the cerebellar surfaces as well as prominent enhancement involving the right greater than left ependymal surfaces of the bilateral, right greater than left occipital horns, not significantly changed compared to 6/18/2015. No new enhancing lesion. No new focus of restricted diffusion to suggest infarct. Unchanged caliber of the ventricular system without evidence of hydrocephalus. Major flow-voids are preserved. Trace mucosal thickening involving the paranasal sinuses. Paranasal sinuses otherwise clear. Mastoid air cells are clear. Bone marrow signal and extracranial soft tissues are within normal limits.
1. Previously seen left cerebellar abscess has resolved.2. Leptomeningeal enhancement involving the cerebellar surfaces as well as along the ependymal surface of the lateral ventricles is not significantly changed and compatible with leptomeningeal infection and ventriculitis. Leukemic involvement however can not be entirely excluded and continued follow-up is suggested as clinically indicated. 3. No new enhancing lesion, edema, mass effect, or hydrocephalus.