<prompt> A classical expansive lytic lesion in the transverse process of a vertebra is seen in -OsteosarcomaAneurysmal bone cystOsteoblastomaMetastasis  <response>: Both ABC and osteoblastoma can arise in the posterior elements of vertebrae i.e. Pedicle, lamina, transverse process or spinous process.ABC produces lytic lucent lesion, while osteoblastoma produces lytic lesion surrounded by a rim of sclerosis. 