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Regionallymph node metastases are one of the most common routes of tumor spread in colorectal carcinoma. In the past decade, CT has been used in the staging of colorectal carcinoma. However, the accuracy of CT in detecting regional nodal metastasis has not been satisfactory, varying between 22% and 73% [1 , 2]. Because of the paucity of information in the imaging literature of this subject, we review the distribution of lymph node metastases on CT scans of patients with colorectal carcinoma.The purpose of this pictorial essay is to illustrate the CT appearance of the groups of nodes that can be the site of metastases or recurrent disease from colorectal carcinoma. The focus is on the left side of the colon (the descending colon and sigmoid colon), the rectum, and the anus.

Malignantsmall round cell tumor of the abdomen is a newly described clinicopathologic entity.