<prompt> Vertebra plana seen in -a Eosinophilia granulomab Traumac Pagets diseased Malignancye Ewings sarcomaabcdbcdeabdeade  <response>: Vertebra plana This term is used to describe uniform collapse of a vertebral body into a thin, flat disc. The most common cause is eosinophilic granuloma, with the thoracic vertebrae most frequently affected. Causes are :-Histocytosis - X Eosinophilic granulomaLeukemiaTBMetastasis, Multiple myeloma, Ewings sarcoma, lymphomaOsteochondritis of vertebral body Calves diseaseHemangiomaTraumaSteroids 