<prompt> A classical expansile lytic lesion in the transverse process of a vertebra is seen in:OsteosarcomaAneurysmal bone cystOsteoblastomaMetastasis  <response>: b Aneurysmal bone cystLytic Lesion in Posterior Element of Vertebrae i.e. spinous process, transverse process, and pedicle Expansile and Purely lytic, Aneurysmal Bone Cyst, Non-expansile and partly or extensively ossified, Osteoblastoma Body of vertebra is involved in GCT 