患者，男．57岁。于1994年5月17日因左臀部肿物10余天住院治疗，该患入院前10余天，无意中发现左臀部有一肿物。除坐位不适外，无明显疼痛感．无腰腿疼及肢前节不适，无发热。无息性创伤史。入院后查体：患者一般情况良好，于左臀部坐骨结书处触及一个超鸡卵大小近园形肿物，边 Patient, male. 57 years old. On May 17, 1994, he was hospitalized for more than 10 days because of a left hip mass. The patient had accidentally found a tumor on the left hip for more than 10 days before admission. In addition to sitting discomfort, there is no apparent pain. No waist and leg pain and anterior limb discomfort, no fever. History of non-invasive trauma. Physical examination after admission: The patient was generally in good condition. He touched a super chicken egg size near the round-shaped tumor on the left buttock.