颞下颌关节弥漫型巨细胞瘤的CT表现

Diffuse type giant cell tumour of the temporomandibular joint:CT imaging findings

目的:研究发生于颞下颌关节(temporomandibular joint,TMJ)的弥漫型巨细胞瘤的CT影像特点。方法:回顾性分析8例经病理检查证实、发生于TMJ区的弥漫型巨细胞瘤的CT图像。结果:8例中,男女比例为1∶1,平均年龄45.1岁,所有8例病变都表现为膨胀性生长的软组织肿块,且增强后有不同程度的强化。其中,6例肿块密度增高,关节间隙增宽。髁突骨质改变7例,另外6例颞骨关节面骨质破坏并侵犯颅内。结论:发生于TMJ的弥漫型巨细胞瘤的CT影像学特征表现为较高密度的软组织肿块,伴强化,髁突及颅底骨质破坏并侵犯颅内。

PURPOSE： The purpose of this study was to determine the characteristic computed tomography（CT） findings of diffuse type giant cell tumour of the temporomandibular joint（TMJ）.METHODS： Eight subjects with diffuse type giant cell tumour of the TMJ were examined with contrasted CT scans.All lesions were histopathologically confirmed through surgery.CT appearances of the lesions were reviewed.RESULTS： Among the 8 subjects,8（100%） demonstrated soft tissue swelling and further enhancement,6（75%） demonstrated entire or focal areas of noncontrast hyperdensity,6（75%） had widening of the joint spaces.Bony changes of the mandibular condyles were found in 7（87.5%） subjects.Bony changes of articular surfaces and intracranial extensions were found in 6（75%） subjects respectively.CONCLUSION： Based on the CT findings,diffuse type giant cell tumour of the TMJ is characterized by hyperdensity soft tissue swelling and further enhancement,bony destruction of the mandibular condyles and skull base,and intracranial extension.