Osteoma

An osteoma is a new piece of bone growing on another piece, typically the skull.

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Bone: Bone is a type of hard endoskeletal connective tissue found in many vertebrate animals. Bones support body structures, protect internal organs, and (in conjunction with muscles) facilitate movement; are also involved with cell formation, calcium metabolism, and mineral storage. The bones of an anima...

Skull: A skull, or cranium, is a bony structure of vertebrates which serves as the general framework for a head. The skull supports the structures of the face and protects the brain against injury....