Cytomegalovirus-related neutropenic enterocolitis with negative CMV antigenemia as the initial presentation in an acute myeloid leukemia patient

Abstract

Dear Editor, A 35-year-old gentleman, with the past history of diabetes mellitus for 2 years, was transferred to our hospital in 2007 because of cecal enterocolitis with septic shock and pancytopenia. Fever and right lower quadrant (RLQ) abdominal pain without nausea, vomiting, or diarrhea developed 8 days before admission, and he visited another hospital 3 days after onset of symptoms. Pancytopenia with absolute neutrophil count of 250/mL was detected at that time, and abdominal computed tomography (CT) scan revealed prominent wall thickening with submucosal edematous change in cecum and ascending colon. Although broad-spectrum antibiotics were used for several days, abdominal pain and pancytopenia persisted. So, he was transferred to our hospital. On admission, the patient was mildly febrile (37.8°C); physical examination showed distended abdomen with a tenderness over RLQ. Laboratory findings disclosed: white blood cell count, 5.0×10/l (absolute neutrophil count 300/mL, segment 3%, band 3%, blast 15%, atypical lymphocyte 74%), hemoglobin, 11.5 g/dl; platelet, 44× 10/l; C-reactive protein, 156.7 mg/l. After bone marrow exam, acute monocytic leukemia (M5b) was diagnosed. Cefepime, metronidazole, and IV fluid support for bowel rest were given for his neutropenic enterocolitis. He received induction chemotherapy with the regimen, idarubicin 12 mg/m/day for 3 days, and cytarabine 100 mg m day for 7 days. However, fever, abdominal pain, and RLQ tenderness with abdominal fullness persisted even after white blood cell count recovered from nadir. There was no diarrhea or bloody stool during the course. Blood cultures, urinalysis, and stool cultures all yielded negative results. Serology test was negative for anti-HIV. Abdominal CT scan was repeated and revealed thickening of cecal wall with peri-colic inflammation. Because typhlitis with ileus persisted under conservative treatment, he underwent right hemicolectomy. Histological examination of the cecum showed: (1) ulceration and necrotic debris over the mucosal wall of cecum; (2) some enlarged cells with eosinophilic nuclear inclusions (Fig 1.) which were positive for cytomegalovirus (CMV) stain by CMV monoclonal antibody (clone CMV 01, Neomarkers; Fig. 2). The diagnosis of typhlitis with CMV infection was made. CMV-pp65 antigenemia assay, as determined by immunofluorescence, was negative. Three weeks of Ganciclovir was added. No more fever or abdominal pain was noted after operation, and the patient recovered gradually with normal oral intake. Neutropenic enterocolitis or typhlitis is a clinical syndrome in neutropenic patients characterized by fever and abdominal pain. It was originally described in children following induction chemotherapy for acute leukemia [1] and subsequently reported in both adults and children with a variety of hematologic and solid malignancy, in patients with acquired immunodeficiency syndrome, and as a complication of bone marrow transplantation [2]. The development of typhlitis has historically been attributed to a variety of chemotherapeutic regimens. Mucosal injury caused by cytotoxic drugs combined with neutropenia and impaired host defense to intestinal organism leads to the occurrence of typhlitis [3]. However, in this patient, neutropenic enterocolitis is the initial presentation of acute leukemia before treatment of any chemotherapeutic agents Ann Hematol (2009) 88:279–280 DOI 10.1007/s00277-008-0596-3