Pelvic actinomycosis with hydronephrosis and colon stricture simulating an advanced ovarian cancer

Pelvic actinomycosis is an uncommon disease in humans. It has nonspecific and variable clinical features, and thus it is difficult to diagnose. Moreover, appropriate management is delayed or overlooked because it can sometimes simulate advanced ovarian cancer. We report a case of pelvic actinomycosis which manifested with hydronephrosis and bowel stricture, lymph node enlargement and increased level of tumor marker caused by a large pelvic mass. Since this case showed clinical findings mimicking an advanced ovarian carcinoma, it was surgically diagnosed as actinomycosis after neoadjuvant chemotherapy.