[Secondary psoas actinomycosis: a complication of an intra-uterine contraceptive device]

Genital-pelvic actinomycosis is an uncommon disease which often arises on women with long term use of intrauterine device. Its diagnostic remains difficult. Even if different clinical locations has been reported, location to the psoas muscle is exceptional. We report such a case, diagnosed on a 53 years old woman. Both a tumoral and a severe infectious syndrome appeared three months after an intra-uterine device removal. The septic syndrome led to a laparotomic approach. Unusual clinical presentation, delay between device removal and septic syndrome and lack of genital infection explain the issues to reach the final diagnosis.