Pelvic hydatid cyst: differential diagnosis with a bacterial abscess with cutaneous fistula

The genus Echinococcus is a worldwide tapeworm with a two host mammalian cycle. Among the six described species, Echinococcus granulosus (EG) and Echinococcus multilocularis are the most important in respect to their public health importance. Infected human, as an intermediate accidental host, presents single to several cysts, mainly located in the liver. We are describing the clinical, radiological and histological findings of a woman born in Morocco, recently arrived in France and presenting a pelvic hydatid cyst. The misknowledge of such a diagnosis conducted to initial surgery and thus a risk of further metastasised lesions. We are suggesting that any hypoechogenic pelvic lesion in a patient originated from a Mediterranean country should be considered as a pelvic localization of EG.