Postop follow-up. Posterior fossa arachnoid cyst fenestration surgery. There is no evidence of acute ischemic lesion.There is evidence of suboccipital craniotomy with intra or acoustic cyst hemorrhage indicating postoperative status.The size of intracystic blood clot is about 11 x 9 mm.Estimated major size of subarachnoid cyst on sagittal scan at the level of quadrigeminal plate was 22.5 mm x 24.2 mm, on today's scan, it is measured 16.4 mm x 21. 2 mm indicating interval size decrease especially cranial caudal direction.The ventricles, sulci and cisterns are symmetric and unremarkable. The gray-white matter differentiation is normal. The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. The paranasal sinuses and mastoid air cells are clear.
Postoperative status, suboccipital craniotomy and fenestration of posterior fossa subarachnoid cyst.Interval size reduction of posterior fossa subarachnoid cyst especially cranial caudal direction (22.5 mm x 24.2 mm to 16.4 mm x 21.2 mm).Demonstration of intracystic blood clot likely related to surgical procedure, 11 mm x 9 mm.Otherwise no remarkable finding.