An unusual localization of cyst hydatidosis associated with cardiac hydatid disease.

A 50-year-old woman was admitted to our clinic for surgical removal of cardiac hydatid cyst. Before the admission, she had been referred to other clinic with signs and complaints of a large mass in the medial aspect of the left upper leg and severe pain. A multiloculated hydatid cyst between the iliopsoas and pectineus muscle had been diagnosed using an ultrasonography and magnetic resonance imaging (MRI). Magnetic resonance images demonstrated a well-defined cystic mass containing a few round lesions. The mother cyst had a thin, low-signal intensity rim on T1 and T2 weighted sequences. The daughter cyst exhibited a very low signal on T1-weighted images. Indirect hemagglutination and Western-Blot tests for echinococcus antibodies were also positive. After the diagnosis, albendazole 10 mg/kg daily for three months had been given immediately. At the follow-up, the symptoms disappeared and the MRI confirmed that the amount of the cystic lesions have decreased and