患者女,49岁。3个月前无明显诱因左侧腰腹部持续性胀痛,渐加重,伴恶心、厌食。病程中无肉眼血尿,无尿痛、尿急、尿频,无发热及明显消瘦。于个1月前左腹部可扪及包块,渐增大。体检:左中腹部包块,质硬,触痛。CT平扫示左肾盂区巨大软组织肿块影,密度不均匀,部分突出于肾盂(图1)。 Female patient, 49 years old. 3 months ago no obvious incentive left lumbar sustained pain, gradually heavier, with nausea, anorexia. No gross hematuria in the course of the disease, no dysuria, urgency, frequent urination, no fever and significant weight loss. In a month ago left abdomen palpable mass, increasing. Physical examination: left middle abdominal mass, hard, tenderness. CT scan showed a large soft tissue mass in the left renal pelvis with uneven density and some prominent in the renal pelvis (Figure 1).