作者报告一例罕见的颞颌关节软骨肉瘤的CT表现。患者女,49岁,左耳前区肿胀、左耳痛。体检左腮腺区有4×2.4cm的坚硬肿块,颞颌关节活动受限,左外耳道后移、左传导性耳聋。CT示左颞颌关节软组织肿块并向关节下方延伸至下颌支外侧,向前侵犯颞下窝的后外方。肿块的关节外部分有钙化。髁状突前移、 The authors report a rare CT appearance of temporomandibular joint chondrosarcoma. Female patient, 49 years old, left ear area swelling, left earache. Physical examination of the left parotid gland region with 4 × 2.4cm of the hard mass, temporomandibular joint activity is limited, the left external auditory canal after the shift, left conductive deafness. CT showed the left temporomandibular joint soft tissue mass and extended to the joint below the mandibular branch outside the infratemporal fossa forward infringement. The outer part of the mass is calcified. Condyle forward,