Abstract
Hydatid disease is a parasitic tapeworm infection that usually involves liver and lungs. Primary skeletal muscle hydatid cyst without liver and lung involvement is rare. En bloc resection without inducing rupture and spreading the daughter cyst is recommended treatment strategy and accepted to be curative for intramuscular hydatid cyst. We report a case of primary hydatid cyst of the erector spinae muscle which was treated successfully with ultrasonography guided puncture, aspiration, injection of 95% ethanol and re-aspiration (PAIR) technique.