Craniotomy for laser ablation for astrocytoma. There are postoperative findings related to laser ablation with interval decrease in size and enhancement of a tectal plate mass that now measures approximately 12 x 18 mm in cross-section, previously 16 x 19 mm. There is no evidence of acute intracranial hemorrhage or acute infarct. The right cerebral convexity fluid collection has resolved. There is a right transfrontal Ommaya catheter that terminates adjacent to the right caudate nucleus. There are also postoperative findings related to endoscopic third ventriculostomy, with an apparent jet of cerebrospinal fluid into the third ventricle. Nevertheless, the third and lateral ventricles remain enlarged. There is no midline shift or herniation. There is a left cerebellar hemisphere developmental venous anomaly. The major cerebral flow voids are intact. The orbits, skull, and scalp soft tissues appear unchanged. There is diffuse paranasal sinus mucosal thickening.
1. Postoperative findings related to laser ablation with interval decrease in size of a tectal pilocytic astrocytoma.2. Postoperative findings related to endoscopic third ventriculostomy, with an apparent jet of cerebrospinal fluid into the third ventricle. Nevertheless, the third and lateral ventricles remain enlarged. 3. The right transfrontal Ommaya catheter terminates adjacent to the right caudate nucleus.