SUMMARY
This retrospective study reviewed unicameral bone cysts (UBCs) and aneurysmal cysts (ABCs) of bone with a total of 452 patients treated at Baltalimani Bone Diseases Education and Research Hospital, Turkey between 1981 and 2012. The aim of this study is to determine the unusual sites of common benign bone cysts which are relatively common in orthopaedic practice.There were 353 patients in the UBC group and 99 patients in the ABC group. Humerus, femur and calcaneus were the most common sites of involvement in the UBC group and femur, humerus, tibia and fibula were the most common sites of involvement in the ABC group. Unusual locations for the both groups were forearm, hand and foot bones. As a result the possibility of ABC and UBC must be kept in mind in every bone, especially for ABCs it is important to remember that nearly half of cases seen in unusual places.