Non-spinal hydatid disease of bone: A series of 9 cases

Objectives: Extra-spinal hydatid disease of bone is reported in a small number of case series. In ‎this study, we report our experience with extra-spinal hydatid disease of the bone in a series of ‎nine patients.‎ Patients and Methods: In a retrospective study, patients who were diagnosed with an extra-‎spinal osseous hydatid disease were included. All patients were treated surgically. Preoperative ‎anthelmintic drugs were employed for the cysts that were diagnosed before the operation. ‎Postoperative chemotherapy was performed for all patients.‎ Results: The study population included nine patients, including seven males and two females, ‎with a mean age of 45.2±7.9 years and an average follow-up of 4.1±2.7 years. Non-specific pain ‎was the most common symptom at presentation. Pelvic bones were the most frequent site of ‎involvement. Serologic tests were false negative in seven patients. The disease was diagnosed ‎preoperatively in five patients that all of them were located in flat bones. The cysts were treated ‎by radical excision in four patients, extended curettage in four patients, and amputation in one ‎patient. Recurrence of the lesion was recorded in two patients, that both of them were treated by ‎intralesional curettage. One case of suppuration was the only postoperative complication of this ‎series.‎ Conclusion Hydatid disease of bone is a serious disease with challenging diagnosis, difficult treatment, and ‎significant morbidity. Preoperative diagnosis is generally easier in flat bones. Radical resection is ‎the optimal treatment of hydatid disease of bone. Non-radical resection is associated with a ‎higher risk of recurrence. ‎