Acetabular Hydatid Cyst in a Teenage Girl: A Rare Manifestation and Successful Long-Term Management With Combined Surgical and Anthelmintic Approaches

Hydatid disease is a zoonotic infestation caused by the <i>Echinococcus</i>, with extremely rare bone involvement. We present a case of acetabular hydatid cyst in a 16-year-old girl who initially underwent wide surgical excision, adjuvant ablation, and local administration of anthelminthic agent followed by systemic anthelmintic therapy. After 5 years, due to the development of degenerative joint disease and as infection was suspected intraoperatively, a 2-stage total hip arthroplasty was performed. The patient's prosthesis remained stable and well fixed, and she is now fully functional at the 12-year follow-up. The consideration of hydatid disease in the differential diagnosis of destructive bone lesions, particularly in endemic areas, is crucial for timely detection and effective treatment. This case report highlights the challenges in the surgical treatment of periacetabular bone hydatidosis.