<prompt> Commonest location of aneurysmal bone cyst is: September 2006FemurPelvisVeebraeTibia  <response>: Ans. D: Tibia Regarding the location of the aneurysmal bone cyst, any bone may be affected. Approximate frequencies by site are: Skull and mandible 4 Spine 16 Clavicle and ribs 5 Upper extremity 21 Pelvis and sacrum 12 Femur 13 Lower leg 24 Foot 3 Sho tubular bones are less frequently affected and are involved in about 10 of cases. Spinal involvement demonstrates a predilection for the posterior elements. In decreasing order of frequency, the following pas of the spine are involved: cervical, thoracic, lumbar. Contiguous veebrae may be involved in 25 of cases. The cyst involves the diaphysis in isolation in about 8 of cases 