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对近10年来76例≤30岁青年人大肠癌临床及病理特点，误诊原因加以分析。发现青年人大肠癌随年龄增长患病率逐渐增高，26～30岁占半数以上，男女发病无显著差异。血便或粘液血便、腹痛、腹泻、大便变细及腹块为其常见临床表现，易误诊，早期诊断率低，常伴转移，手术切除率低。病变好发于直肠及乙状结肠，大体形态以溃疡型最多，浸润型远高于中老年组，组织学类型以粘液腺癌及中低分化腺癌占多数。
The clinical and pathological features of colorectal cancer and the causes of misdiagnosis were analyzed in 76 patients aged 30 years or younger in the past 10 years. It was found that the prevalence of colorectal cancer in young people increased gradually with age, with 26 to 30 years of age accounting for more than half, and there was no significant difference between men and women. Bloody or mucous bloody stools, abdominal pain, diarrhea, thin stool and abdominal mass are common clinical manifestations. They are often misdiagnosed, have low early diagnosis rate, often have metastasis, and have a low surgical resection rate. The lesions occurred in the rectum and sigmoid colon. The general morphology was the ulcer type, and the infiltrative type was much higher than that in the middle-aged group. The histological types were mucinous adenocarcinoma and moderately-differentiated adenocarcinoma.