Chondroma is an intramedullary neoplasm made of well-differentiated hyaline cartilage.It is not cancer. The tumor usually occurs in the hands or feet, but it may also occur in the upper arm, thigh, collarbone, ribs, pelvis, spine, skull, and nasal sinuses. By: https://link.springer.com/chapter/10.1007/978-3-030-29676-6_15