Bone tumours-What's new in the 2020 WHO classification and beyond

The recent WHO classification of Bone Tumours (2020) has introduced several changes. Conceptionally, small round cell sarcomas are now summarized in a distinct chapter, acknowledging their occurrence in both, bone and soft tissue. In the light of new molecular findings some diagnostic categories, such as fibrohistiocytic tumors, have been abandoned, and a few new entities have been added to the classification. Finally, systematic changes were made with regard to the terminology employed in the classification of chondrogenic tumours, and modifications have been made with respect to the biological potential of some lesions. This article summarizes the major changes made, underscoring the elementary role of an interdisciplinary approach in the diagnosis and management of bone lesions.

Automated summary

The recent WHO classification of Bone Tumours (2020) has brought about significant changes, including the acknowledgement of small round cell sarcomas occurring in both bone and soft tissue, the abandonment of certain diagnostic categories, the addition of new entities, modifications in the terminology for chondrogenic tumours, and changes in the biological potential of certain lesions.