Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 28 1-4 1986 12 15 47 60 MOHAMMAD JAHANGIR 2015 09 28 Ewing sarcoma is about 10 % of bone tumours, in the form of lytic, sclerotic and mixed type. The lytic type erodes the whole bone in such a way that the auther would like to name it 'Vanishing' type and recognition of this radiological type is of great importance from differential point of view in the study of primary and secondry tumours of bones. https://acta.tums.ac.ir/index.php/acta/article/view/195 https://acta.tums.ac.ir/index.php/acta/article/download/195/191