恶性黑色素瘤是一种少见的肿瘤,该病侵犯邻近骨组织而被长期误诊者,鲜有报导。我院于1985～1986年先后收治两例,现报道如下: 病例报道 例1,女,18岁,3年前发现右踝前方有一约蚕豆大小肿块,后渐出现踝部肿痛,皮肤正常。摄片见关节间隙狭窄,诊断为“关节炎”、“右踝关节结核”,给予对症及抗痨治疗加石膏固定半年,辗转两年多以后因病情更趋恶化而来我院求治,拟诊“右踝滑膜肉 Malignant melanoma is rarely seen as a rare tumor, and it has long been misdiagnosed by invading adjacent bone tissue. Two cases were treated in our hospital from 1985 to 1986. The cases are reported as follows: Case report Example 1, female, 18 years old. Three years ago, we found that there was a sizeable tumour in front of the right iliac crest. Then there was swelling and pain in the palate. The skin was normal. The radiography revealed stenosis of the joint space and was diagnosed as “arthritis” and “right ankle tuberculosis.” Symptoms and anti-tuberculosis therapy plus plaster was given for six months. After more than two years, the condition deteriorated and came to our hospital for treatment. "Right gluteal synovial meat