Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy (PLO-SL): a genealogical study of Swedish families of probable Finnish background.

Four Swedish families in northern Sweden with polycystic lipomembranous osteodysplasia (PLO-SL) were studied genealogically. Historical and genealogical date provided evidence for a Finnish origin. Both parents of two of the families could be traced back to Finnish ancestors, and the other two families had a common origin in a region with a known Finnish influence, but without evidence for Finnish ancestry. PLO-SL is the first rare monogenic disease with an autosomal recessive inheritance in Sweden with a probable Finnish origin.