颞下颌关节滑膜软骨瘤病的影像诊断

目的：探讨颞下颌关节滑膜软骨瘤病的X线、C T、M RI征象，提高对本病的认识。方法回顾性分析经手术病理证实的8例颞下颌关节滑膜软骨瘤病的X线、CT、MRI表现，8例患者均行普通X线和CT平扫检查，6例同时行MRI平扫检查，2例加做M RI增强扫描。结果8例均单侧发病，右侧6例、左侧2例。X线示颞下颌关节间隙增宽，关节周围多发结节状钙化影。C T平扫示关节周围软组织密度肿块伴多发钙化游离体。MRI平扫示关节腔内多发结节状长 T1、短T2信号，滑膜增厚并呈等 T1、等及稍长T 2信号，关节腔内积液。M RI增强示滑膜组织明显均匀强化，游离体呈边缘强化。结论颞下颌关节滑膜软骨瘤病有典型的影像学表现，总结其X线、C T、M RI表现可以为临床诊断及治疗提供一定帮助。

The imaging diagnosis of synovial chondromatosis of the temporomandibular joint

Objective To investigate X‐ray ,CT and MRI features of synovial chondromatosis of the temporomandibular joint (TMJ) .Methods X‐ray ,CT and MRI features of eight patients of synovial chondromatosis of TMJ with histo‐pathologically con‐firmed were analyzed retrospectively .X‐ray examination and CT scanning were performed in all eight patients .Routine MRI scanning was performed in six patients and contrast‐enhanced MRI scanning was performed in two patients synchronously .Results Tumors occured unilaterally in all eight cases ,which occured on the right TMJ in six cases and on the left side in two cases .On X‐ray films , widen joint space and calcificated loose bodies occured in all eight cases .On CT scanning ,cystic‐solid mixed mass around the joint and calcificated loose bodies occured in all eight cases .On MR scanning ,multiple nodular long T1 and short T2 signal occured in six cases . Arthroedema and synovial hyperplasia with iso T1 and iso or slightly long T2 signal in six cases .On contrast‐enhanced MR ,homoge‐neous enhancement occurred in svnovial tissue and the edge of loose bodies in two cases .Conclusion The synovial chondromatosis of TMJ owns typical imaging features .The imaging findings can serve as a reference to improve diagnosis of synovial chondromatosis of TMJ .