Intra-abdominal Actinomycosis Imitating Sigmoid Colon Cancer: A Case Report.

Actinomycosis is a rare bacterial disease characterized by chronic or subacute suppurative inflammation. Abdominal actinomycosis is rarer and accounts for approximately 20% of all actinomycosis cases. In the literature, patients who underwent surgery for actinomycosis mimicking malignant tumors have been reported. Most of these patients had mucosal trauma and inflammation signs. It is often difficult to diagnose abdominal actinomycosis preoperatively and often impossible to distinguish it from a malignant tumor. We present a case that preoperatively was diagnosed as a malignant tumor but pathological evaluation reported to be diverticulitis and actinomycosis. This case can increase the awareness about this disease, which is possible to be treated non-surgically.