CASE REPORTS
JOURNAL ARTICLE
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Incontinentia pigmenti (Bloch-Sulzberger-syndrome): case report and differential diagnosisto related dermato-ocular syndromes.

BACKGROUND: Incontinentia pigmenti (IP; Bloch-Sulzberger syndrome) is an inherited disorder of skin pigmentation that is associated with skin (100%), dental (90%), skeletal (40%), central nervous (40%) and ocular (35%) abnormalities. The pathogenesis is not yet known. The disease is usually seen in females, as it is an X-linked dominantly inherited disease which is lethal in males.

PATIENT PRESENTATION: We present a 9-year-old girl with the classical general and ocular signs of IP. She presented in early childhood with inflammatory vesicular skin changes which changed into pigmented skin alterations especially on the trunk. Ocular findings were microphthalmia and retrolental mass formation in one eye and retinal pigmentary changes in the other. In our patient, the spontaneous mutation may have been caused by the family's close neighbourhood to Semipalatinsk, Kasachstan, where regular nuclear tests took place very shortly before the pregnancy with our patient began.

DISCUSSION: Ocular involvement is described in about a third of persons affected with IP. A nearly consistent and pathognomonic finding is a pigment retinopathy (mottled diffuse hypopigmentations). A further consistent finding are abnormalities of peripheral retinal vessels with areas of non-perfusion in the outer retina. The retinal pigment epitheliopathy and the abnormalities of retinal vessels are thought to be the underlying pathognomonic findings, with all other ocular signs being secondary (cataract, leucocoria, optic atrophy, strabismus, nystagmus and microphthalmus). Exudative retinal detachment occurs only in a minority, usually in very early childhood, when the skin lesions are exudative as well. IP patients should, however, be clinically observed regularly because of their retinal pigmentary changes.

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