患者,男性,34岁,于1989年2月1日到毛里塔尼亚国家卫生中心寄生虫室就诊。主诉不久前从加蓬回来后,发现右臂上部、右侧背部各长1个肿块,时而痛或痒感。查体:病人举止言谈正常,只在右臂肘窝上偏体侧约10cm处有1个突出皮肤表面的肿物,肿物表面皮肤红肿,面积约2 cm~2。在肿物偏上方明显可见1个圆形缺口,直径约 The patient, male, 34 years old, presented to the Parasite Room of the Mauritanian National Health Center on February 1, 1989. After his chief complaint came back from Gabon, he found a lump in the upper right arm and right back of the right arm, which was sometimes painful or itchy. Physical examination: The patient’s behavior was normal. He only had a prominent skin surface mass about 10 cm from the side of his right cubital pedicle. The skin surface of the mass was red and swollen, with an area of ​​about 2 cm~2. Obviously visible in the top of the tumor is a circular notch, diameter of about