Diaphysis
Template:Short description Template:Infobox anatomy The diaphysis (Template:Plural form: diaphyses) is the main or midsection (shaft) of a long bone. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat).
It is a middle tubular part composed of compact bone which surrounds a central marrow cavity which contains red or yellow marrow. In diaphysis, primary ossification occurs.
Ewing sarcoma tends to occur at the diaphysis.<ref>Physical Medicine and Rehabilitation Board Review, Cuccurullo</ref>
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Long bone
