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J Korean Surg Soc. 2009 Dec;77(Suppl):S17-S21. English. Case Report.
Suh SW , Kim YS , Park JM , Kim MK , Park YG , Chi KC , Lee JH , Lim HM .
Department of Surgery, College of Medicine, Chung-Ang University, Seoul, Korea.
Department of Pathology, College of Medicine, Chung-Ang University, Seoul, Korea.

Actinomycosis is a rare infection caused by Actinomyces species, normal commensal inhabitants of the human bronchial and gastrointestinal tract. Infection occurs after preceding mucosal break-down by variable causes. A preoperative diagnosis is difficult because of its nonspecific clinical features, mimicking malignancy, tuberculosis or other inflammatory diseases. We report a case of abdominal actinomycosis presenting as an omental mass, which coexists with ascending colon cancer. Actinomycosis was diagnosed by histopathologic demonstration of sulfur granules in a specimen resected by laparoscopic exploration. Following surgery, the patient was treated with IV penicillin (20 million IU/day) for 3 weeks, and follow-up colonoscopy showed adenocarcinoma in the ascending colon. The patient underwent right hemicolectomy, then treated with intravenous penicillin for 4 weeks postoperatively and oral penicillin for 6 months. The patient has been free of recurrence for 6 months.

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