We report the successful management of multiple small-bowel perforations caused by cytomegalovirus (CMV) infection in a 60-year-old man, 1 day after CHOP (cyclophosphamide/doxorubicin/vincristine/prednisone) therapy induction for malignant lymphoma. Emergency laparotomy was performed for perforative peritonitis, but we did not resect the lesions at this time. Instead, we exteriorized the small bowel and then irrigated the peritoneal cavity and intestinal tract. His white blood cell count was low, at 200 cells/µl, so this therapy was continued until it recovered. The intestine was highly edematous, but it improved after irrigation with peritoneal dialysis solution. In the second-stage procedure, we resected the small bowel with the perforations, and constructed a jejunostomy and colostomy, then closed the abdominal cavity. Although the patient needed central venous hyperalimentation, he had a favorable postoperative course and started treatment again for the malignant lymphoma.