[ Results] These rare malignant tumors were detected on irrigoradioscopy as protrusion lesions or luminal stenosis of inferior segmental rectum or anal canal, usually associated with irregular niches. 【结果】气钡灌肠示该类肿瘤主要表现为直肠下端或肛管隆起性病变,肠腔明显狭窄,可伴不规则龛影,肉瘤常较大,而恶性淋巴瘤常表现多发。