Cystic echinococcosis (CE) is caused by infection of the larval stage of Echinococcus granulosus sensu lato (s.l.), in whose transmission cycle dogs, cattle and humans are involved. The taxonomy of E. granulosus s.l. includes several species/genotypes. The case of a three-year-old female patient who presented gastrointestinal symptoms is described here. Ultrasound and tomography revealed nine hydatid cysts, one of which was large, and intraperitoneal fluid. Treatment with albendazole and surgical management was decided upon. Microscopic and histological analyses of the surgical material confirmed the parasitic etiology and by measuring rostellar hooks it was determined that the etiological agent might belong to the E. granulosus sensu stricto group. She was discharged with warning guidelines and follow-up due to the risk of secondary disease and the sequelae of having lost a large part of the liver parenchyma and gallbladder. This case shows the severity with which pediatric CE can occur.