[Synchronous medullary and mucinous tumor in the right colon: case report].

Colon cancer according to the World Health Organization is classified histologically as: adenocarcinoma in 95%, mucinous adenocarcinoma 3.9-19%, signet ring cell carcinoma 1-2%, small cell carcinoma less than 1%, medullary carcinoma in less than 1%, undifferentiated carcinoma and neuroendocrine carcinoma 1-2%. Medullary and mucinous carcinoma usually occur in the right colon predominantly in females and are associated with microsatellite instability. The incidence of synchronous colorectal tumors varies between 1.3 and 7.3%, 43% of them are located proximal to the main lesion and one third are advanced tumors. To our knowledge there are no reports of synchrony in the right colon.

Objective

To present a case report. Clinical Case: Patient operated for a right colon tumor diagnosed by videocolonoscopy, presenting in the anatomopathological study two tumors, one of mucinous origin and the other a synchronous medullary tumor.

Conclusion

This case reveals the importance of correlating endoscopic findings with the anatomopathological study of the surgical specimen, since videocolonoscopy can underdiagnose synchronous tumors, particularly those located in the right colon.