<prompt> A 35-year-old lady with chronic backache. On X-ray she had a D12 collapse. But intervertebral disk space is maintained. All are possible except:Multiple myelomaOsteoporosisMetastasisTuberculosis  <response>: d- Characteristic radiological feature of Potts spine is obliteration of disk space with destruction of two adjacent vertebrae.- This feature differentiate TB spine from other diseases causing vertebral destruction like metastasis in which disk space is preserved. 