RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
This tumor is an uncommon benign cartilaginous neoplasm arising from the bone. It is characterized by the presence of spindle-shaped or stellate chondrocytes, a lobulated growth pattern, myxoid stroma formation, and sometimes multinucleated giant cells. It has been associated with chromosomal rearrangement of 6q13 and 6q25 bands. The most common clinical symptom is mild, localized pain.