system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A classical expansile lytic lesion in the transverse process of a vertebra is seen in:
assistant
The correct answer is  (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