Aneurysmal bone cyst is an uncommon tumor-like lesion of the bone containing distended vascular channels or cvities filled with blood. These cases, twenty-nine old female, eighteen years old male and female patients complained of pain and swelling in Rt. Medial aspect of proximal foot, Lt. proximal tibial portion and Rt. entire talar aspect of foot, respectively. Roentgenograms showed ballooned-out distensions and eccentric buldging of those lesions and soapbubble like multiple radiolucent cystic changes within interiors of the bones at talar neck, Proximal tibia and entire talus. Those cases were treated with radical curettage and autogenous iliac bone grafts and snugly fitted long leg casts in functional positions, respectively. On 2nd postoperative day, Cast windows were made and daily sterile dressings were carried out until complete wound healing. Pathological Examinations grossly and Microscopically revealed typical Aneruysmal bone cysts in all 3 cases. All-Patients had good therapeutic recovery within about seven weeks post-operatively.