大腿骨上端部に発生した巨大な Aneurysmal Bone Cyst の1例

抄録

A male, aged 31 years, was admitted with complaint of swelling on outer aspect of his for two years.
On physical examination, the swelling was remarkable, rounded and hard, and ulceration was found on its top. The gluteal and adjacent muscles became thin and atrophic. Radiograph revealed a voluminous cystic mass in proximal part of the femur which expanded eccentricall, showing thin layer of the cortex and coarse trabeculae in it. The femoral head and neck were completely destroyed.
Under clinical diagnosis of aneurysmal bone cyst, disarticulation of the hip was performed and the stump was covered with the medial flap containing the adductor muscles.
The excised tumor was measured about 24×13×12cm oval in size. The appearance of the cut surfaces of it was darkish red, encapsulated with the thin bony shell, and had many cavities of various sizes Histologically, fibrous tissues infiltrated with lymphocytes were found which were dotted with multinucleated giant cells and hemosiderine deposits. In another areas of the same specimens, many irregular cavities separated by fissues and lined with endothelial on their inner surfaces, so called benign vascular channels, were found.
Three months after the operation, the patient is in good clinical conditions.