患者男性，63岁.左膝外侧电击伤30余年，形成溃疡，经久不愈。近月余溃疡面积增大迅速，有恶臭，疼痛剧烈。左腹股沟淋巴结肿大，增长迅速，活动度差、质硬，触癌明显。临床诊断：左膝部皮肤溃疡，疑有恶变。病理检查标本为灰红、灰白色不整形组织3块，最大者1．5cm×1cm×1cm The patient was male, 63 years old. His left lateral knee was electrically injured for more than 30 years, resulting in ulceration and prolonged healing. In recent months, the area of ​​ulcers has increased rapidly, causing bad smell and severe pain. The left inguinal lymph nodes are swollen, with rapid growth, poor activity, and stiffness, and striking cancer. Clinical diagnosis: Left knee skin ulcers, suspected malignant transformation. The pathological examination specimens were gray-red and gray-white without plastic tissue, the largest one was 1.5cm×1cm×1cm