降结肠癌是常见的恶性肿瘤,其临床表现为便血、粘液血便、腹痛以及腹部肿块。癌肿坏死可能导致肠穿孔,穿孔部位通常位于腹膜内,而腹膜后的穿孔则很少见。加之结肠癌腹膜后穿孔所引起的临床症状和体征缺乏特异性,这就使得临床医生很难在手术之前就对疾病做出准确的诊断,由此可以 Descending colon cancer is a common malignancy, the clinical manifestations of hematochezia, mucus bloody stool, abdominal pain and abdominal mass. Necrosis can cause intestinal perforation, perforation of the site is usually located in the peritoneum, and retroperitoneal perforation is rare. Combined with the lack of specificity of the clinical signs and symptoms caused by retroperitoneal perforation of colon cancer, which makes it very difficult for clinicians to accurately diagnose the disease before surgery,