抄録
The authors report a rare case of membranous obstruction of Magendie's foramen with internal hydrocephalus. A 30-year-old male was referred from another hospital because of dilatation of the entire ventricular system, as evidenced by computed tomography (CT). The patient had suffered headache, dizziness, nausea, and vomiting for several years. On admission, bilateral papilledema was prominent. A ventriculoperitoneal shunt was emplaced on the next day. Postoperative CT showed that the lateral and third ventricles had decreased in size, while the fourth ventricle was still enlarged. The patient rejected further surgery and was discharged. Three months later the symptoms reappeared. The patient underwent a suboccipital craniectomy, which revealed a semi-translucent membrane obstructing Magendie's foramen. The membrane was resected, and histopathological examination disclosed that it was composed of loose connective tissue, which was partially cellular and contained hemosiderin deposits, covered by a layer of flattened cells. After surgery, all symptoms disappeared and the patient was discharged. At 6 months after discharge, the fourth ventricle had decreased in size.
