Introduction: The hydatid cyst, or hydatidosis, is an anthropozoonos is attributable to the development of the larval form of the tænia Echinococcus granulosus in humans. The renal location constitutes an unusual location, it comes thirdafter the pulmonary and hepatic localizations.
Observation: We report the case of a child aged 5 years 10 months, admitted to the pediatric emergency for right low back pain and hydaturia, associated with micturition burns, evolving for a week in a context of fever and conservation of general condition.
Biologically, we had noted an important inflammatory syndrome with out hypereosinophilia. Cytobacteriological examination of the urine showed a proteus mirabilis urinary infection sensitive to 3rd generation cephalosporins.
The anatomopathological study of the membranes was in favor of the hydatidcyst.
Radiologically, the vesico-renalultrasound and the CT scan revealed a type II upper polar right renal hydatid cystaccording to the GHARBI classification with calcifications of the lower caliciel group. The extension report did not show anyother location. The patient had received intravenous antibiotic therapy based on ceftriaxone for 3 days and oral relay for 7 days then additional surgical treatment by resection of the prominent dome. The clinical course was favorable.
Conclusion: Primary renal hydatidosis is very rare, its association with a urinary tract infection requires concomitant management of the two pathologies which make the singularity of our observation.