Unusual Presentation of Colonic Adenocarcinoma at Third Trimester with Possible Underlying Familial Adenomatous Polyposis Detected on ( 18 F)-FDG PET-CT

Colorectal carcinoma during pregnancy is a rare entity, often presenting with nonspecific symptoms that can be misattributed to physiological changes associated with pregnancy. We present the case of a 30-year-old female with a history of spontaneous preterm delivery, in whom postpartum ultrasonography revealed multiple hypoechoic lesions in the liver. 18 F-fluorodeoxyglucose ( 18 F-FDG) positron emission tomography/computed tomography (PET/CT) done to characterize the liver lesions, revealed multiple FDG concentrating polypoidal lesions in the colon, multiple hypodense liver lesions and tumor sink effect. This case highlights the atypical presentation of colorectal carcinoma during pregnancy and emphasizes the pivotal role of 18 F-FDG PET/CT in delineating disease extent and identifying metastatic sites.