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目的探讨颞下颌关节区滑膜软骨瘤病的MRI表现特点。资料与方法搜集7例主诉为颞下颌关节区肿胀、疼痛、杂音或者张口受限患者的MRI影像资料,对其斜冠状面和斜矢状面的张闭口位T1WI、T2WI进行分析。所有病例均经关节镜手术或开放性手术病理证实为滑膜软骨瘤病。结果颞下颌关节滑膜软骨瘤病的MRI表现为:(1)病变区有单个或多个散在软骨小体或钙化游离体(n=7);(2)关节腔大量积液(n=7);(3)关节区软组织肿大(n=5);(4)关节盘形态和位置异常(n=2);(5)下颌髁突骨质异常改变(n=3),表现为骨皮质连续性中断和/或骨髓腔减少;(6)颞骨关节面骨质异常改变(n=2),表现为骨质硬化。结论颞下颌关节滑膜软骨瘤病的MRI表现多为单个或多个散在的软骨小体或钙化游离体伴关节腔大量积液;往往伴有关节区软组织肿胀;少数病例可侵犯邻近的骨质,引起髁突或颞骨关节窝等骨质的破坏或伴有关节盘形态或位置异常。
Objective To investigate the MRI features of synovial chondromatosis in temporomandibular joint. Materials and Methods Seven patients with focal, swollen, painful, murmur or mouth restricted MRI data were collected and analyzed for T1WI and T2WI in their oblique coronal and sagittal planes. All cases were confirmed by arthroscopic surgery or open surgery pathology as synovial chondromatosis. Results The MRI findings of temporomandibular joint synovial chondromatosis were as follows: (1) There were single or multiple scattered cartilaginous bodies or calcified dissociated bodies (n = 7) in the lesion area; (2) ); (3) soft tissue enlargement in the joint area (n = 5); (4) abnormal disc shape and location (n = 2); Cortical continuity disruption and / or marrow cavity reduction; (6) temporal bone surface joint abnormalities (n = 2), manifested as sclerosis. Conclusions The MRI findings of temporomandibular joint synovial chondromatosis are mostly single or multiple scattered cartilage bodies or calcified free joint with a large amount of fluid in the joint cavity, often accompanied by swollen soft tissue in the joint area. In a small number of cases, the adjacent bone mass may be infringed , Causing condyle or temporal bone joint bones and other bone destruction or associated with disc morphology or position abnormalities.