Ichthyosis vulgaris showing features of the autosomal dominant and the X‐linked recessive variants in the same family*

A family in which the mother and six of her sons present an ichthyosis of the vulgaris type has been analysed clinically, histologically and electron microscopically. Pheno-typically the ichthyosis in the mother is purely of the dominant type, while that in all the affected sons shows, to varying degrees, features of both the dominant and X-linked recessive variants. The findings are interpreted as reasonably good evidence that the mother has transmitted to all her affected sons both the autosomal dominant and the X-linked recessive genes for ichthyosis. Although genetically this is a most unusual situation, it corresponds best to our findings.