一卵性双生児の第1子にみられた側頭部くも膜嚢腫

A Case of Arachnoid Cyst of the Left Middle Cranial Fossa in a Twin of the Identical Twins

Ⅰ．はじめに

　側頭部くも膜嚢腫はさほどまれな疾患ではないが，その成因に関して先天説，炎症説，外傷説等があり，その病態，治療に関しても意見の一致をみず未解決な問題が多い．最近では，Robinson^8,9）に代表されるごとく先天性奇形によるものが多いとする説が優勢のようである．われわれは一卵性双生児の1児（姉）で，全身痙攣発作を主訴として来院し，開頭によるくも膜嚢腫剔出術後の長期観察を経て，後天性の原因によると思われた1例を経験した．また本例は双生児の1児にみられたものとしておそらく最初の報告例と考えられ，本疾患の成因をさぐる上で意義あるものと考え，臨床所見を呈示すると共に若干の文献的考察を試みた．

A patient, 18 years old female, was admitted to our service with chief complaint of episodes of drug-resistent general convulsive attack on May 23rd, 1975. She was bone with a full term as the first infant of twins. At one year of her age, she fell down from about 3 meters high and hit her head. She had two limes of general convulsive attack within one year after this accident. Since then, she had an uneventful growth. However, general convulsive attacks and psychomotor seizures were reappeared in 4 to 6 years of her age. Anticonvulsant agents were given on her condition, and the epileptic attacks were controlled well.