Hydatidosis is a parasitic infection caused by the cestodeEchinococcus granulosususually occurring in the liver and lungs. Hydatid cyst of the neck is a rarely described location and more so on the back of the neck. We present a case of a six-year-old girl with a slowly evolving mass on the back of her neck. Medical investigations revealed a secondary asymptomatic liver cyst. MRI of the neck mass was consistent with a cystic lesion. Surgical removal of the neck cyst was performed. Pathological examination results confirmed the diagnosis of hydatid cyst. The patient was put on medical treatment with a complete recovery and uneventful follow-up.