Primary hydatid cyst in an unexpected localization.

Echinococcal disease remains a problem within some endemic areas. It usually involves the liver and lungs, but any other organ can potentially be involved. Soft tissue hydatid disease without liver and lung involvement was reported in 2.3 % of patients. This paper presents a case of 35-year-old male patient who was referred to our department with a 9x9x6cm hydatid cyst at psoas muscle. The rarity of the musculoskeletal disease renders the decision making on the favorable treatment quite difficult. Conservative treatment, complete excision and simple drainage have all been suggested as adequate. We advocate total en bloc excision whenever possible (Fig. 2, Ref. 4).