PMID: 8951893Nov 1, 1996Paper

Intraventricular arachnoid cyst--on the origin of intraventricular arachnoid cysts

Nō to shinkei = Brain and nerve
K OkamuraK Wakabayashi

Abstract

Arachnoid cysts very rarely occur within the ventricular system, where no arachnoid tissue exists. We present three cases of intraventricular arachnoid cyst with special reference to its origin. The first patient was a 5-year-old boy who complained of headaches and enlargement of his head. A CT scan revealed obstructive hydrocephalus and a large cystic lesion in the right lateral ventricle. The symptoms resolved after fenestration of the cyst and cystoperitoneal shunt. The second patient was a 49-year-old woman who complained of headache and numbness in her left upper extremity. A CT scan and MRI revealed a large cyst in the trigone of the right lateral ventricle. Fenestration of the cyst wall and cystoperitoneal shunt were performed relieving her complaints. The third patient was a 42-year-old man who complained of frequent seizures and dizziness. A CT scan and MRI demonstrated a moderate size cystic mass in the inferior horn of the right lateral ventricle. The symptoms were improved by partial resection of the cyst wall. Immunohistochemical studies and light microscopy confirmed that the cyst walls were composed of arachnoid membrane, implying that the cysts were arachnoid cysts. CT and MRI in these three cases showed widenin...Continue Reading

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