Hydatid disease is caused by Echinococcus granulosus, a tapeworm which forms larval cysts in human tissue. Dogs, and in some endemic areas foxes, are the definite hosts. These animals eat sheep carcasses containing hydatid cysts. Human infection follows ingestion of material contaminated by dog faeces. The ova penetrate the intestine and pass via portal circulation to the liver or lungs where they develop into hydatid cysts. *'2 The embryos that escape the barriers of the portal sinusoids or pulmonary capillaries enter into the systemic circulation and can implant in any tissue or organ. Hydatid cysts may develop in the spleen, kidneys, pancreas, brain, myocardium, thyroid gland, musculoskeletal and soft tissue. ~'2 Arterial involvement is extremely rare, most being peripheral embolic episodes with the heart and aorta as primary sites of origin. 3-s In our reported case, a hydatid cyst developed in the arterial lumen of the femoral artery, with coexisting cysts in the adductor muscles and the scrotum.