CEACAM5 and cyst: Abdominal CT and MRI are valuable to understand the nature of the mass, its relationship with the surrounding tissues, and to determine whether the cysts are undergoing carcinoma transition.[13,14] MRI is better than CT in locating the cyst, determining the nature of the contents of the cyst, and identifying the relationship between the cyst and the surrounding tissues.[13] Typical MRI findings include long T1 and T2 signals and multilocular manifestations.[15] High levels of CEA might indicate the carcinoma transition of a TGC.