Primary intramuscular and intermuscular Echinococcal disease of the iliopsoas and sartorius muscles: A case report

Hydatid disease is a parasitic infection caused by the Echinococcus tapeworm. Classically, Echinococcal lesions are slowly growing cystic masses with daughter cysts. The most common sites of disease are the liver in 75% of cases and lungs in 15% of cases. This report covers a case of a patient from Southeast Europe with primary extrahepatic hydatid disease in and along the left iliopsoas and sartorius muscles. Retroperitoneal and soft tissue Echinococcus infection without liver involvement is extremely rare and creates a diagnostic challenge for clinicians and radiologists, especially in nonendemic areas.