Incidental Finding of Colon Carcinoma Related to High Uptake in 18F-PSMA-1007 PET.

We present a 78-year-old man with suspicion of prostate cancer due to a PSA of 200 ng/mL, who underwent F-PSMA-1007 (prostate specific membrane antigen) PET/CT for primary staging. Besides heterogeneous uptake to the prostate, an increased PSMA uptake in the cecum was observed, located in the thickened cecal wall with suspicion of a secondary malignancy. Colonoscopic biopsy followed by hemicolectomy confirmed the diagnosis of colon adenocarcinoma. This case demonstrates the importance of bioptic workup of suspicious findings on PSMA PET/CT, which are unlikely to be related to prostate cancer as PSMA ligand uptake is not exclusively prostate cancer specific.