例１男，４０岁。因右小腿痛，右小趾变黑５个月，以脉管炎、趾坏疽收住皮肤科，治疗无明显效果，且右小腿出现肿块转至普外科。体检：右小腿明显萎缩，后下方触及１０ｃｍ×５ｃｍ大小肿块，质硬；右足小趾轻度肿胀，趾端甲床及趾腹见暗黑色干痂。血钙、磷及ＡＫＰ正常。... Example 1 Male, 40 years old. Due to pain in the right calf, the right little toe became dark for 5 months. He received vasculitis and genital necrosis and received dermatology. The treatment had no obvious effect, and a mass in the right leg was transferred to the general surgery. Physical examination: The right calf was obviously shrunk, and the lower part touched a lump of 10cm x 5cm in size, and the mass was hard; the right foot was slightly swollen with small toes, and the toe sac showed a dark, black diarrhea on the nail bed and toe belly. Blood calcium, phosphorus, and AKP are normal. ...