鼻骨骨折の臨床的研究

Clinical Research on Nasal Bone Fractures

　はじめに

　鼻骨骨折は顔面骨骨折のなかで最も頻度が高い。画像診断はその補助診断として効果的であるが，限界があるとされている^1）。CT撮影法は単純鼻骨撮影に比し，骨折の状態を明らかにするのに優れているが，単純な鼻骨骨折の日常的な診断方法とは言えない。今回，単純側方向撮影と高分解能CTの所見を比較し，鼻骨骨折の診断における側方向撮影法の有用性について若干の知見を得たので報告する。

Twenty cases of nasal bone fractures were evaluated by conventional lateral view and HRCT in axial scan. The nasal bone was divided into three portions of upper, middle and lower. The findings of fractures were classified into three categories:1)disruption of the nasal dorsum, 2) fracture line parallel to the dorsum and 3) fracture line close to the nasomaxillary suture. The findings were record-ed as fracture present, fracture absent and inconclu-sive.

The findings of lateral view matched those of HRCT as follows; 36% at the upper portion. 80% at the middle portion, and 90% at the lower portion. Both false positive and false negative results were mostly seen at the upper portion.