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n. pl. di·aph·y·ses (-sēz′) Anatomy
The shaft of a long bone.

[Greek diaphusis, spinous process of the tibia, from diaphuesthai, to grow between : dia-, dia- + phuesthai, to grow, middle voice of phuein; see bheuə- in Indo-European roots.]

di′a·phys′i·al (dī′ə-fĭz′ē-əl), di·aph′y·se′al (dī-ăf′ĭ-sē′əl, dī′ə-fĭz′ē-əl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.diaphyseal - relating to the diaphysis of a bone
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Diaphyseal aclasis, also termed Hereditary Multiple Exostosis (HME) or osteochondromatosis is characterised by multiple bony prominences that grow near joint lines throughout the skeleton.
Malignant change in a previously benign tumour is largely restricted to conditions such as multiple exostoses (diaphyseal aclasis) and multiple enchondromatosis or Ollier's disease, where a relatively slow-growing chondrosarcoma develops in middle age.
The disease congenital diaphyseal aclasis was considered but the growths usually join the bone at right angles to the bone shaft (Edeiken & Hodes 1967: 104, 107).