目的 探讨单发型四肢长骨内生软骨瘤的临床和影像学特征。方法 回顾性分析12例经手术病理证实的单发型四肢长 骨内生软骨瘤的临床和影像资料。结果 X线平片12例，分为三种表现：2例仅表现为钙化，1例仅表现为骨质破坏， 骨质破坏伴钙化9例。CT检查8例，所有病例均显示骨质破坏伴瘤内不同程度的钙化，CT显示小的骨质破坏及细微钙 化更有价值。MRI检查7例，所有病灶境界清楚，平扫T1WI呈低信号为主，1例病灶内见斑片状高信号，T2WI均呈不 均匀明显高信号，增强后4例病灶呈环形不均匀强化，3例呈斑片状不均匀强化。X线平片、CT及MRI图像所有病例均 未见骨膜反应及软组织肿块。结论 单发型长骨内生软骨瘤多具有典型的影像学特征，综合X线平片、CT和（或） MRI对本病大多数可做出定性诊断与鉴别诊断。

Objective To probe the clinic and imaging features of solitary enchondroma in long bone of limbs. Methods Clinic and imaging date of 12 patients with solitary enchondroma in long bone of limbs confirmed by surgical pathology were analyzed retrospectively. Results All patients had been underwent X-ray film. Calcification only in 2 cases, bone destruction only in 1case, and bone destruction with calcification in 9 cases. CT was performed in 8 cases and all cases showed bone destruction with varying calcification inside the lesions. CT was optimal to detect the minor destruction of bone and slight calcification. 7 cases were received MRI examination. All cases were hypointense on T1WI mainly, with stippling high signal intensity on T1WI in 1 case, and significantly high signal intensity on T2WI. On post contrast images, 4 cases showed “ring-and-arc” like heterogeneous enhancement and 3 plaque-like heterogeneous enhancement. There were no periosteal reaction and soft-tissue mass on all imaging finds. Conclusion Most of the solitary enchondroma in long bone of limbs had typical imaging features, the qualitative and differential diagnosis of which can be made mostly by X-ray film, CT and MRI.