Hydatid cyst involves both hard and soft tissues even without the evidence of the disease in liver or lungs; however, this manifestation is very rare, particularly in musculoskeletal regions). The current report describes a case with primary diagnose of cystic gluteal swelling leading to diagnose of hydatid cyst after surgical exploration in an 80-yr-old woman the Surgical Outpatient Department, Imam Hossein Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran. During surgery, the cavity was washed by silver nitrate and the cyst content was appropriately evacuated. The patient had completed a short course of albendazole postoperatively. Early postoperative complications were not appeared. The patient was followed for 6 months with no evidence of recurrence or complications.