CT manifestations of colorectal mucinous adenocarcinoma
CHEN Zi-min1, LI Zhen-hui2, DONG Xing-xiang2, GAO De-pei2, ZHANG Da-fu2
1. Department of Radiology, Duanzhou Pepole’s Hospital, Zhaoqing Guangdong 526040, China; 2. Department of Radiology,
the Third Hospital of Kunming Medical University, Cancer Hospital of Yunnan Province, Kunming 650118, China
Abstract：Objective: To explore the CT findings of colorectal mucinous adenocarcinoma. Methods: The CT scans of 109 cases of colorectal mucinous adenocarcinoma confirmed by surgery and pathology were reviewed retrospectively． Results: The tumors were located in the rectum in 44 cases, the sigmoid colon in 22 cases, the ascending colon in 26 cases, the transverse colon in 10 cases, and the descending colon in 7 cases. The tumor length ranged from 1.9 to 17.6 cm(mean 6.1 cm) with mean thickness of 2.1 cm(ranged from 0.6 to 5.6 cm). CT showed annular bowel wall thickening in 89 cases, regional bowel wall thickening in 11 cases, polypoid mass-forming in 9 cases. Nonenhanced CT scan showed hypodense lesions, calcification in 20 cases and contrast-enhanced CT showed heterogeneous enhancement patterns. Contrast-enhanced CT also showed different degree of low density region in the lesions, massive low-density region in 49 cases, moderate low-density region in 39 cases, and little low-density region in 21 cases. Perirectal or pericolic infiltrations were moderate to severe. In the tumor spread patterns, lymph nodes metastasis was noted in 57 cases, peritoneal carcinomatosis in 25 cases, liver metastasis in 7 cases, liver and ovary metastasis in 1 case, and lung metastasis in 1 case. Conclusion: There were some features of primary colorectal mucinous adenocarcinoma in CT. It usually showed annular bowel wall thickening with low-density region, partly with calcification, lymph nodes and peritoneal carcinomatosis.
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