小儿原发性结肠恶性肿瘤少见，我院自1986年11月~1996年11月共收治3例，现报告如下。例1男，4岁。1989年11月20日入院。2月前无明显原因出现右中腹疼痛、恶心，间断呕吐，7天前开始出现果酱样大便，无腹胀、发热等。查体：消瘦体质，右中下腹可及一约6cm×4cm的条索状包块，质 Pediatric primary colorectal cancer rare, our hospital from November 1986 to November 1996 were treated in 3 cases, are as follows. Example 1 male, 4 years old. November 20, 1989 admission. 2 months ago there was no obvious reason for right middle back pain, nausea, intermittent vomiting, 7 days ago began to appear jam-like stool, no bloating, fever and so on. Physical examination: weight-loss constitution, the right lower abdomen and can be about a 6cm × 4cm cord-like mass, quality