Author(s): Yuji Ohtsuki, Yoshinori Tanaka, Katsuhito Kubo, Akira I. Hida, Atsushi Kurabayashi, Gang-Hong Lee, and Mutsuo Furihata
Here, we report a rare case of an 81-year-old man with bloody stools who was finally diagnosed with cytomegalovirus (CMV) proctitis. He was treated with steroids owing to the presence of idiopathic interstitial pneumonia, which was considered, on radiological examination, to be cryptogenic organizing pneumonia. After steroid administration, the pulmonary shadows improved. However, CMV proctitis was subsequently diagnosed by immunohistochemical staining of biopsied rectal tissues using an anti-CMV antibody, although 3 biopsies of the rectum were necessary for the final and correct diagnosis. This report describes a rare case of CMV proctitis in a patient with idiopathic interstitial pneumonia, treated by steroid administration. As demonstrated in the current study, clinicians should bear in mind CMV infection, especially in immunocompromised patients.