Colo-colic intussusception is a rare manifestation of a primary tumour in an adult patient. This article
aims to document the rarity of colo-colic intussusception features on the 18 FDG- PET-CT in a patient
with primary colonic carcinoma. An 18 FDG-PET-CT was performed for the purpose of pretreatment
staging of a colonic carcinoma in a 61-year-old man following a diagnostic colosnoscopic biopsy. He
presented with abdominal distension and peri-rectal bleeding for a month. The fused 18 F-FDG PET-CT
image revealed an FDG-avid mass in the left hemicolon showing a rim of FDG avidity denoting the head
of intussusceptum. There are also multiple FDG-avid nodules seen along the anti-mesenteric colonic fat
suspicious for lymph nodes metastasis. Debulking of tumour revealed a mucinous adenocarcinoma of
colon with a metastatic lymph node. 18 FDG PET-CT features of intussusception in colonic carcinoma
have never been described before. It can potentially become a preferred diagnostic tool in delineating a
potential tumour mass within the intussusceptions that help improve prognosis in patients with malignancy.