Clinical features and computer-aided analysis of chromosome aberration in a case with incontinentia pigmenti.

Incontinentia pigmenti (IP) is an X-linked dominant disease, usually lethal to males. IP belongs to rare diseases involving skin pathological findings, together with neurological and ophthalmological disorders. We here report a two-year old girl with typical symptoms of the IP. A hitherto unreported feature is partial deletion of short arms of one of the chromosomes 15, found in the girl and in her mother. Using an automatic chromosome picture analyzer, a densitometric analysis of the aberration was carried out, in order to determine the break point and to compare the normal and deleted chromosomes.