Cystic echinococcosis is an infectious disease secondary to the contamination by Echinococcus granulosus. Muscle localization is very rare, and is characterized by atypical clinical presentation and the absence of pathognomonic signs, leading to diagnosis delays. MRI is the method of choice for diagnosis of soft tissue hydatid cysts, and surgery remains the main curative treatment. We report a case of hydatid cyst of the adductor magnus muscle in a 24-year-old young man, along with a literature review.