18F-FDG PET/CT of Seminal Vesicle Metastasis From Ascending Colon Adenocarcinoma.

The most common metastatic sites of colorectal cancer are the regional lymph nodes, liver, lungs, and peritoneum. Seminal vesicle metastasis from colon adenocarcinoma is not reported yet; the diagnosis could be challenging. We report a case of seminal vesicle metastasis from a primary ascending colon adenocarcinoma in a 49-year-old man, with elevating carcinoembryonic antigen as the only clinical sign. This also highlights the role of F-FDG PET/CT to detect metastatic adenocarcinoma from colon in the genitourinary system.