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epithelial dysplasia. Definitions: 1. a disorder of differentiation of epithelial cells which may regress, remain stable, or progress to invasive carcinoma. The definition information for epithelial dysplasia is provided by Stedman's. You can search our medical dictionary here.
Fibrous dysplasia (FD) is a skeletal disorder in which bone-forming cells fail to mature and produce too much fibrous, or connective, tissue. Areas of healthy bone are replaced with this fibrous tissue.ibrous dysplasia is caused by a defective gene in the cells that form bone and other affected tissues. The defect occurs at some point after conception, most likely early in fetal development.