A benign bone tumor or growth arising from the endosteum; an abnormal bony growth on the inner surface of a bone.
From endosteum + -oma (tumor). Medical term from pathology, combining bone terminology with tumor classification developed in the 1800s-1900s.
Endosteomas are usually harmless, but they demonstrate how bone tissue can overgrow internally—similar growths elsewhere in the body would immediately flag as tumors!
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