Two cases of unusual cystic lesion are reported.
Case 1 A 20-year-old female was seen by authors with tenderness around her right hip.
Roentgenogram of her right hip revealed an unusual cystic lesion of great trochanter.
At this surgery, the lesion consisted of only cavity. There was no fluid in the cavity and this cavity was not lined by a thin menbran. Histological examination of excised wall showed only bone trabeculae.
Case 2 A 22-year-old female was seen by authors with pain on walking.
Roentgenogram revealed an unusual cystic lesion of ilium. Macroscopic and micro scopic findings were the same as case 1. There was no organisms in the cavity.
The authors could not diagnose these lesions as bone cyst, and the authors consider that the selesions are distinct entity.