Clinical question: Preop planning Stealth MRI. Craniotomy for cavernous malformation resection. Signs and symptoms: Preoperative Stealth brain MRI. Pre and post stealth brain MRI:Examination is performed utilizing a Stealth protocol for surgical planning and is not a true diagnostic exam.Examination demonstrates a previously known cavernoma in the posterior left median midbrain. The lesion measures approximately 11.5 x 15 mm in transaxial dimensions. Finding is not associated with any detectable surrounding edema and supplies subtle mass effect on the quadrigeminal plate cistern and mildly bulges into the superior aspect of the fourth ventricle.Compared to prior exam there is no appreciable interval change.There is a tiny left frontal developmental venous anomaly present.There is no additional detectable foci of abnormal parenchymal or leptomeningeal enhancement. Ventricular system remains within normal size and without deviation of midline.
Cavernoma measuring approximately at 11.5 x 15 mm in the left paramedian posterior midbrain without surrounding edema and with subtle mass effect as detailed.