Dx Retinitis pigmentosa
- The presence of bone spicules, which are black or brown concentrations of pigmentation, is pathognomonic.
- Causes of retinitis pigmentosa
- Laurence-Moon-Bardet-Biedl syndrome (Autosomal recessive)
- Refsum’s diseases (Autosomal recessive)
- Hereditary ataxias
- Familial neuropathies
- Neuronal lipidoses