罕见跖趾软骨黏液样纤维瘤X线及MR影像学诊断

Rare Metatarsophalangeal Chondromyxoid Fibroma: X-ray and MR Findings

目的:研究跖趾软骨黏液样纤维瘤的X线及MR表现以提高影像诊断准确率。材料与方法:回顾分析经手术病理证实的2例跖趾骨软骨黏液样纤维瘤的X线及MR图像,并与病理结果对照分析。结果:跖趾软骨黏液样纤维瘤有以下特点:(1)好发于青少年;(2)常达近侧关节面;(3)分叶状膨胀性骨质破坏,伴不完整硬化边;(4)内缘多发不规则短粗骨嵴;(5)X线上呈皂泡状;(6)MR信号不均,T2WI呈明亮高信号,间有不规则低信号区。结论:跖趾软骨黏液样纤维瘤的影像学表现易与其它良性骨肿瘤混淆,但仍有一定特征性,X线联合MR检查有助于该瘤的鉴别诊断。

Purpose： To investigate the X-ray and MR manifestations of metatarsophalangeal chondromyxoid fibroma （CMF） in order to improve its diagnostic accuracy. Materials and Methods： The X-ray and MR images of two patients with metatarsophalangeal CMF were retrospectively analyzed, and compared with their pathological results. Results： Metatarsopha- langeal CMF has the following characteristics： （1） occur in adolescents; （2） often reach the proximal articular surface; （3） lobulated expansive bone destruction, with incomplete sclerotic rim; （4） multiple irregular bone crest stubby on the inner edge; （5） X-ray showed soap bubble sign; （6） MR showed heterogeneous signal with bright high signal on T2 WI and irregnlar low signal zone. Conclusion： Metatarsophalangeal CMF usually confused with other benign bone tumor, although there are still a certain characteristics. X-ray combined with MR examination is helpful to its differential diagnosis.