<prompt> Which of the following is the most probable diagnosis of the patient with the following x-ray?OsteoporosisPotts spineMetastatic bone diseaseMultiple myeloma  <response>: Ans. is b i.e., Potts spine Characteristic radiological feature of potts spine is obliteration of disc space with destruction wedge compression of one or two adjacent vertebrae. This feature differentiates Kochs spine from other diseases causing vertebral destruction like metastasis, multiple myeloma, in which disc space is preserved. 