[Bone tumors in children and adolescents].

Osseous lesions are rare; however, their incidence is increased in childhood and adolescence. The spectrum of osseous processes in this age group is limited, with benign lesions being much more prevalent than malignant tumors. For the differential diagnosis, it is essential to have in-depth knowledge of the more frequent bone diseases in children and adolescents. The current review presents these diseases based on the morphologic approach of the WHO classification, including giant cell-rich and cystic lesions, chondrogenic and bone-forming lesions [7]. Small round cell sarcomas which are now summarized in a separate chapter of the WHO classification have been described previously [12, 20].