hyperostosis corticalis generalisata

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van Buchem disease

An autosomal recessive condition (OMIM:239100) characterised by hyperostosis of the skull, mandible, clavicles, ribs and diaphyseal cortices of long bones, as well as a massively enlarged jaw and thickened skull, leading to facial nerve palsy, hearing loss and optic atrophy.

Molecular pathology
van Buchem disease is caused by a genomic deletion of a long-range bone enhancer on chromosome 17q12-q21, which misregulates sclerostin.
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hyperostosis corticalis generalisata

Generalized cortical hyperostosis, see there, aka Van Buchem's disease.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.