“…There are a mean of 7 weeks between the discovery of the vertebral collapse and hematologic diagnosis [4]. This delay is due, firstly, to the fact that many diagnostic can discuss: isthmic spondylolysis, Schumann's disease, spondylodiscitis and bone malignancies [5,6], David et al reported a retrospective study of 29 cases of children with malignancies initially addressed in pediatric rheumatology unit (juvenile chronic arthritis, spondyloarthropathies ...) [3], on the other hand, the possible absence of biological orientation with an initial normal blood count [6].…”