Isolated diaphragmatic hydatid cyst: a rare entity in the paediatric population.

Isolated primary diaphragmatic hydatid disease (HD) occurs in approximately 1% of adult cases. However, this unique presentation of a pediatric diaphragmatic cystic mass has not been previously described in the literature. This study reports a rare case of a 12-year-old girl who was diagnosed with a diaphragmatic hydatid cyst. Surgical exploration via subcostal incision revealed an isolated cyst, free from the thoracic and abdominal viscera. Cystotomy, removal of daughter cysts, and excision of the pericyst cavity were performed, followed by diaphragmatic repair. Histopathological examination confirmed the diagnosis. The postoperative course was uneventful, and the patient completed an 8-week mebendazole regimen with no recurrence at 3 months' follow-up. This paper recommends including HD in the differential diagnosis for pediatric patients presenting with diaphragmatic lesions, particularly in regions endemic for echinococcosis.