目的: 探讨不典型部位内生软骨瘤临床表现及X 线、CT、MＲI 对其的诊断价值，掌握其影像学特征。
方法: 回顾性分析18 例内生软骨瘤病人的X 线、CT、MＲI 表现及特点，其中女性11 例，男性7 例，均经过手术病
理证实。结果: X 线及CT 主要表现为患处规则或不规则囊状骨质破坏区，伴或仅表现为沙粒样、爆米花样钙化，
无骨皮质破坏，可见典型征象“扇贝征”。MＲI 表现为分叶状或花环样混杂T 2、混杂T 1 信号改变，内见短T 2
信号，增强扫描后均显示为不均匀的轻度强化，病变边界清楚。结论: 不典型部位的内生软骨瘤有其特征性的临
床与影像学表现，结合多种影像学检查方法综合分析，有助于对其准确的定性诊断。

Objective: To discuss the clinical and imaging manifestations of the untypical endogenous
and master the imaging features．Methods: Analyzing 18 cases of enchondroma which were confirmed
by surgery and pathology．Ｒesults: X－ray and CT showed lesion or irregular cystic lesions of
bone destruction with sand or popcorn like calcification，without cortical bone destruction， some showed
typical signs of Scallop in Shell syndrome．MＲI showed lobulated or rosette like hybrid T2，hybrid T1
signal change，in short T2 signal and after enhanced scanning showed inhomogeneous mild
enhancement lesion with clear boundary． Conclusion: The untypical enchondroma has the typical
clinical and imaging features，combined with the comprehensive analysis of various examination methods，
is helpful for its accurate qualitative diagnosis．

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