Peritoneal hydatidosis is a rare localisation of hydatic disease, most often secondary to a hydatic cyst of the liver. Its primitive form is considered due to a haematogenous diffusion through arterial vessels. We report a historical case of peritoneal hydatidosis concomitant to a hepatic localisation, in a 13-year-old girl. Diagnosis was performed by ultrasounds and CT scan, and a strong positive serology. Surgical cure has been completed by pharmacologic treatment with the aim of avoiding a relapse. A brief reminder of the therapeutic management of the disease is provided.