Mucinous adenocarcinoma (MAC) is a distinct type of colorectal cancer (CRC) associated with poor response to treatment and poorer prognosis. MAC is diagnosed by WHO definition when the extracellular mucin is more than 50% of the lesion. | Colorectal carcinomas with mucinous differentiation are associated with high frequent mutation of KRAS or BRAF mutations irrespective of quantity of mucinous component