Melorheostosis in a family with autosomal dominant osteopoikilosis: report of a third family.

We describe a three-generation family with clinical and radiological findings of osteopoikilosis in five and melorheostosis in one individual. The co-occurrence of both rare bone disorders suggests that both conditions might be related as suggested previously by Butkus et al. [1997: Am J Med Genet 72:43-46] and Nevin et al. [1999: Am J Med Genet 82:409-414]. The findings in this family strengthen the hypothesis that osteopoikilosis is an autosomal dominant condition and that an early postzygotic second hit mutation in the second allele results in melorheostosis.