38 year old male pre op planning for L cerebellar cavernoma resection. Limited sequences are provided for the purpose of surgical planning. Redemonstrated is a heterogeneous intermediate to high T1 signal and mixed low and high T2 signal lesion centered in the left middle cerebellar peduncle with diffuse central and peripheral susceptibility effect, which measures up to 20 mm. There is surrounding vasogenic edema. There is partial effacement of the fourth ventricle, but the third and lateral ventricles are not particularly enlarged. There is no evidence of acute infarct. There is peripheral enhancement of the left cerebellar peduncle lesion which could represent inflammation or lack of a intact blood brain barrier in this region. There is no midline shift or herniation. The orbits, skull, and scalp soft tissues are grossly unremarkable. There is a retention cyst in the left maxillary sinus.
Findings remain suggestive of a recently hemorrhagic left middle cerebellar peduncle cavernous malformation with associated developmental venous anomaly.