Published online Dec 26, 2020. doi: 10.12998/wjcc.v8.i24.6456
Peer-review started: September 4, 2020
First decision: September 30, 2020
Revised: October 11, 2020
Accepted: October 26, 2020
Article in press: October 26, 2020
Published online: December 26, 2020
Processing time: 106 Days and 2.3 Hours
Mucosa-associated lymphoid tissue (MALT) lymphoma is a subtype of non-Hodgkin lymphoma that is mainly involved in the gastrointestinal tract. The synchronous occurrence of colonic MALT lymphoma and adenocarcinoma in the same patient is extremely rare. We here report a case of synchronous colonic MALT lymphoma found on surveillance colonoscopy five months after surgery and chemotherapy for sigmoid adenocarcinoma.
A 67-year-old man was admitted because of hematochezia for two months. Colonoscopy suggested a colonic tumor before hospitalization. Abdominal computed tomography (CT) revealed local thickening of the sigmoid colon. The patient underwent a left hemicolectomy with local lymph node dissection. The histopathology revealed moderately differentiated adenocarcinoma and partially mucinous adenocarcinoma. The pTNM stage was T3N1Mx. The patient received chemotherapy with six cycles of mFOLFOX6 after surgery. Colonoscopy was performed five months later and revealed single, flat, polypoid lesions of the colon 33 cm away from the anus. Subsequently, the patient underwent endoscopic mucosal resection for further diagnosis. The pathological diagnosis was MALT lymphoma. Positron emission tomography /CT suggested metastasis. The patient refused further treatment and died ten months later.
Colonic MALT lymphoma may occur after surgery and chemotherapy for adenocarcinoma as a synchronous malignancy. Regular surveillance colonoscopy and careful monitoring after surgery are critical.
Core Tip: The synchronous occurrence of colonic mucosa-associated lymphoid tissue (MALT) lymphoma and adenocarcinoma in the same patient is extremely rare. Few cases have been reported in the literature to date. Colonic MALT lymphoma is often asymptomatic and found on surveillance colonoscopy. When it presents synchronously with colonic adenocarcinoma, MALT lymphoma is easily missed. Regular surveillance colonoscopy and careful monitoring after surgery are critical. We report a case of synchronous colonic MALT lymphoma found on surveillance colonoscopy five months after surgery and chemotherapy for sigmoid adenocarcinoma.
