Associated Conditions
Retinitis pigmentosa (RP) is seen in a variety of diseases, so the differential of this sign alone is broad.
- RP combined with deafness (congenital or progressive) is called Usher syndrome.
- RP combined with opthalmoplegia, dysphagia, ataxia, and cardiac conduction defects is seen in the mitochondrial DNA disorder Kearns-Sayre syndrome (also known as Ragged Red Fiber Myopathy)
- RP combined with retardation, peripheral neuropathy, acanthotic (spiked) RBCs, ataxia, steatorrhea, is absence of VLDL is seen in abetalipoproteinemia.
- RP is seen clinically in association with several other rare genetic disorders (including muscular dystrophy and chronic granulomatous disease) as part of McLeod syndrome. This is an X-linked recessive phenotype characterized by a complete absence of XK cell surface proteins, and therefore markedly reduced expression of all Kell red blood cell antigens. For transfusion purposes these patients are considered completely incompatible with all normal and K0/K0 donors.
Other conditions include neurosyphilis, toxoplasmosis(Emedicine "Retinitis Pigmentosa") and Refsum's disease.
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