頭蓋内圧亢進時の頭蓋単純写における蝶形骨平面（Planum Sphenoidale）の破壊像について

ROENTGENOLOGICAL OBSERVATION ON EROSION OF THE PLANUM SPHENOIDALE IN CASES WITH INCREASED INTRACRANIAL PRESSURE

Ｉ．はじめに

　頭蓋内圧亢進時の頭蓋単純写レ線所見として，頭蓋拡大，縫合離開，指圧痕の増加，トルコ鞍および後床突起の骨破壊像などは従来よく知られている。これに対して蝶形骨平面（Planum sphenoidale）の破壊像は，Tave—ras^1）らの記載はあるがしばしば見すごされがちであり，また逆に骨破壊像によりただちにその部の病変と誤診されることもある。最近われわれは，蝶形骨平面の破壊像を示す症例を経験したので，これがどのくらいの頻度で起こるものか，またその発現と年齢との関係の有無などについて調査して，頭蓋内圧亢進時の頭蓋単純写における意味を考察した。

Among the roentgenological signs of increased intracranial pressure, erosion of the planum sphe-noidale is one which is apt to be overlooked.

The authors reexamined the plain skull films of 330 patients with intracranial tumor and found oneor more roentgenological significances suggesting increased intracranial pressure in 137 cases. Erosion of the planum sphenoidale was revealed in 8 cases which were distributed in (and near) 12 year of age. The clinical courses in these cases were relatively long and the causing intracranial lesions were situ-ated mostly in the midline. Seven cases of them showed a dilatation of the ventricular system in PEG, suggesting a long lasting effect of pressure of the dilated third ventricle to the erosion of the planum sphenoidale. These evidences may lead to a com-ment that the erosion of the planum sphenoidale is an important sign of increased intracranial pressure of long duration in preadolescent patients.