A Rare Case of Left Thigh Hydatid Cyst.

Hydatid cyst is a parasitic disease caused by Ecchinococcus granulosus that is endemic in the Mediterranean countries, the Middle East, South America, Australia, New Zealand and East Africa. It is a zoonosis that occurs primarily in sheep grazing areas, with dog being the definitive host, sheep the intermediate host and Humans being an accidental hosts who contract the disease from dogs, but there is no human to human transmission. More than 90% of hydatid cyst occur in the liver, lungs or both. Peripheral organ hydatidosis is less common, as only few embryos can escape the capillary filtrating system of the liver and the lungs. Theoretically the high Lactic Acid level in muscle tissue is considered unfavourable for survival of parasite. Primary Hydatid disease of the skeletal muscle is present in approximately 3% of the patients. Approximately 75% of hydatid cyst are located in Right lobe of Liver. Ultrasound is most commonly used for diagnosis worldwide. CT and MRI scans are also helpful. The treatment is primarily surgical. In selected patients PAIR( puncture, aspiration, injection and reaspiration) has been accepted. Albendazole or Mebendazole therapy is given preoperatively as well as post- operatively The aim of this study is to report an unusual case of intramuscular ydatid cyst in the left medial side of the thigh. According to the world literature search only a few cases have been reported.