NCIt definition : A self-limited inflammatory disorder of unknown etiology found in infants that causes
swelling of the soft tissue, changes to bone, and irritability.;
Alternative definition : NICHD: An autosomal dominant condition caused by mutation(s) in the COL1A1 gene encoding
the collagen alpha-1(I) chain. This disease is an acute inflammatory condition of
infancy that causes soft tissue swelling (mostly of chin/cheeks), bone thickening/widening
(particularly of the mandible/clavicles/long bones), pain, and irritability. This
disease generally resolves by the 3rd year of life, although some bony deformity may
persist.;