[A man with an abnormal PET-CT scan].

A 65-year-old patient with rectal carcinoma underwent an 18FDG PET-CT scan. The scan showed nodular foci of 18FDG uptake against the ventral abdominal wall, possibly carcinomatous peritonitis. These abnormalities were caused by a foreign body reaction to a mesh that was placed five months earlier because of an umbilical hernia repair.