[Hereditary ichthyosis in Tunisia: epidemiological study of 60 cases]

Ichthyosis are a group of inherited keratinizing disorders. The cutaneous abnormalities may be isolated or associated with extra-cutaneous symptoms.

To report the epidemiological and clinical profiles of patients with these genodermatoses from a hospital tunisian study.

A retrospective study of all cases of ichthyosis referred during a period of 5 years to the department of dermatology of Charles Nicole's hospital of Tunis.

Sixty cases of hereditary ichthyosis were seen. The sex-ratio was of 0.5. Parental consanguinity was noted in 36 patients (60%). Seventeen patients (25.7%) had a positive familial history of ichthyosis. The clinical form of ichthyosis was determined in 52 cases. The nonbullous ichthyosiform erythroderma was observed in 25 patients (41.6%). Sixty patients presented an ichthyosis vulgaris (26.6%). The other forms of ichthyosis were rarely observed : 4 cases of X-linked recessive ichthyosis, 2 cases of lamellar ichthyosis and 2 cases of bullous ichthyosiform erythroderma. Two patients were born with collodion-like membranes. Two cases presented a complex syndrome.

The NBIE, commonly considered as a rare form of ichthyosis, was the most frequently form seen in our study (41.6%), probably because of the high frequency of consanguineous marriages in Tunisia. The IV represents the most frequent form reported in the literature and was observed in 25% of our patients. The classification of some ichthyosis associated with other extracutaneous abnormalities (found in 2 of our patients) remains difficult.