Cytomegalovirus in Ulcerative Colitis: An Unwanted "Guest".

The role of cytomegalovirus (CMV) in the flare-up of ulcerative colitis (UC) is not clearly understood. CMV can cause similar symptoms in different clinical contexts, which may be attributed to the natural evolution of the viral infection, the patient's immune status, or its association with inflammatory bowel disease (IBD). This study aims to delineate the diverse manifestations of CMV-related lesions from clinical, endoscopic, and histopathological perspectives, alongside a brief narrative review of the literature. In managing IBD patients, it is crucial to be vigilant for signs of CMV reactivation, especially before the initiation of more intensive therapies.