Colorectal mucinous adenocarcinoma is a pathological tissue subtype of rectal cancer, characterized by secretion of a large amount of extracellular mucus. Mucinous adenocarcinoma is a kind of highly invasive carcinoma, with poor prognosis and high recurrence rate, and metastasis to the liver will be similar to cysts, hemangiomas, etc., which can be better identified by MRI. MRI performance] Due to the large amount of extracellular mucus, liver metastasis of colorectal mucinous adenocarcinoma has high signal in T2WI and low signal in T1WI, and after enhancement, hepatic mucinous metastasis shows enhancement of intra-tumor structures, such as fibrous septum and blood vessels, in arterial and delayed phases. However, nodular enhancement similar to that of hemangiomas can be seen on CT, which needs to be differentiated. A, T2WI fat suppression: the lesion is obviously high signal and contains low signal and penetrating blood vessels; B, T1WI congruent image: the metastatic lesion is low signal; C, ART: the tumor structures including blood vessels show some enhancement; the penetrating blood vessels are usually regarded as a sign of a benign lesion; D, delayed stage: the tumor and penetrating blood vessels enhance. Pathological manifestations] A lesion-guided puncture confirms a metastatic lesion containing blood vessels, showing the tumor tissue as patches of mucus and perforating blood vessels. [Differential diagnosis] Hepatic cyst and hemangioma.