Incontinentia Pigmenti is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Incontinentia Pigmenti, or a subtype of Incontinentia Pigmenti, affects less than 200,000 people in the US population.
Source - National Institutes of Health (NIH)
Ophanet, a consortium of European partners, currently defines a condition rare when it affects 1 person per 2,000. They list Incontinentia Pigmenti as a "rare disease".
Source - Orphanet
Bradley, W, et al (eds)
Neurology in Clinical Practice:
Principles of Diagnosis and Management. vol. II, Butterworth-Heinemann,
Boston, pp. 1338-1339 (1991).
Catalano, R.
Incontinentia Pigmenti. American Journal of
Ophthalmology, 110:6; 696-700 (December 1990).
Catalano, R, et al.
Treatment of Proliferative Retinopathy
Associated with Incontinentia Pigmenti. American Journal of Ophthalmology,
110:6; 701-702 (December 1990).
Rahi, J, and Hungerford, J.
Early Diagnosis of the
Retinopathy of Incontinentia Pigmenti: Successful Treatment by
Cryotherapy. British Journal of Ophthalmology, 74:6; 377-379 (June 1990).
Rowland, L (ed).
Merritt's Textbook of Neurology. 8th
edition, Lea & Febiger, Philadelphia, p. 585 (1989).
(Source: excerpt from NINDS Incontinentia Pigmenti Information Page: NINDS)
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