Melorheostosis in a family with autosomal dominant osteopoikilosis.

We describe a 19-year-old woman with melorheostosis and osteopoikilosis (mixed sclerosing bone dysplasia). Her sister and mother had osteopoikilosis, but no evidence of melorheostosis. Isolated melorheostosis and melorheostosis with osteopoikilosis are sporadic disorders. Osteopoikilosis is an autosomal dominant trait. Mixed sclerosing bone dysplasia in a family with autosomal dominant osteopoikilosis raises the possibility that the two bone disorders may be related. This family and that of Butkus et al. [1997: Am J Med Genet 72:43-46] suggest that the melorheostosis could be due to a second mutation at the same locus as that which causes autosomal dominant osteopoikilosis.