Primary subcutaneous hydatid cyst in the left distal thigh.

Human cystic echinococcosis, a zoonotic infection caused by Echinococcus granulosus, remains a largely extended public health problem in endemic regions. Hydatid cyst disease can occur in all viscera and soft tissues, although the liver and the lungs are the most commonly involved organs. Primary hydatid disease of the soft tissue is extremely rare, even in endemic areas, and accounts for 0.