[Unilateral focal dermal hypoplasia].

INTRODUCTION: Goltz's syndrome or focal dermal hypoplasia is an X-linked dominant disease. Patients suffer from cutaneous, bone, dental and ocular disorders. The mutated gene has not been identified. CASE-REPORT: A 16 month-old girl presented, since her birth, numerous malformations and cutaneous lesions. She had only three toes and three metatarsians on the right foot. The right hand possessed only four fingers but five metacarpiens. No bone abnormality was observed on the left side. Cutaneous lesions were also limited to the right side: linear para-median epidermal hamartoma on the face, several areas of alopecia, longitudinal atrophic and hyperpigmented striations on the lower limbs. Both median incisors were dysplasic. Nails of right hand and foot were absent or striated. Radiographies did not show infra-clinical bone lesions. At birth, trans-fontanellar sonography and sonographies of thorax and abdomen were normal, as well as ophthalmological examination. Psycho-motor development was normal. The diagnosis of Goltz syndrome was proposed. There was no other case in the family. DISCUSSION: This case is very unusual because lesions were restricted to the right side. To our knowledge, only one other case has been reported. Mutation de novo is probable and may be post-zygotic. In the future, there is no reason to fear the occurrence of another case in this family.