Both of these tumors classically form a nidus – which is a disorganized mix of small blood vessels, tiny rods of bone called trabeculae, and unmineralized bony tissue called osteoid.

通常这两种肿瘤形成癌巢：癌巢是小血管、小棒状骨（小梁骨）、未矿化骨（即类骨质）等无组织的构成。