Abstract
A 62-year-old male presented with a symptomatic porencephalic cyst following removal of a massive subcortical hematoma. He was admitted with progressive disturbance of consciousness and left hemiparesis. A CT scan demonstrated a massive subcortical hematoma in the right temporoparietal region without intraventricular rupture. Gross total removal of the hematoma was achieved without opening of the ventricle. His consciousness level improved promptly but gradually deteriorated again. Follow-up CT and MRI examinations demonstrated development of a cystic lesion at the site of the hematoma.
On the 17th postoperative day, dark-brown fluid was stereotaxically aspirated, and his symptoms were gradually improved.
This porencephalic cyst formation in the early stage following removal of hematoma is extremely rare in adults. We discuss its possible growth mechanism in detail.
