MOSAIC EXPRESSION OF HYPOHIDROTIC ECTODERMAL DYSPLASIA IN AN ISOLATEDAFFECTED FEMALE CHILD

Background: Hypohidrotic ectodermal dysplasia (HED) is characterized b y hypotrichosis, hypodontia, onychodysplasia and, as the most striking feature, hypohidrosis. The X-linked recessive form of HED, also known as Christ-Siemens-Touraine syndrome, is the most frequent and widely documented form. A clinically identical autosomal recessive form of HE D has also been described. Because of the X-linked mode of inheritance , nearly all observations have concerned pedigrees of predominantly ma le affected patients. We present a rare isolated affected female child with a mosaic expression of HED. We attempted to assess the mode of i nheritance in our case. Observations: We documented the characteristic clinical appearance in our proband, as well as the scanning electron microscopic findings regarding the hair. The starch-iodine test result s in this patient revealed the clinical expression of HED in a mosaic fashion, running along the Blaschko lines. Conclusions: The starch-iod ine test results proved to be useful in the assessment of carriers of X-linked HED, and our proband was considered to an isolated affected f emale with a mosaic expression of HED.