Sagittal brain MRI in a patient with leptomeningeal metastases

Brain magnetic resonance imaging in a patient with medulloblastoma (arrow) with leptomeningeal dissemination. Pre (A) and post contrast (B) T1-weighted sequences demonstrate diffuse abnormal enhancement involving the leptomeninges of the cerebellum (arrowhead) and the ventral surface of the brainstem (dashed arrow).