<prompt> Retinitis Pigmentosa is associated with all except -Usher SyndromeMarfans SyndromeKearns- Sayre SyndromeBussen - Kornzweig Syndrome  <response>: Systemic associations. These are in the form of following syndromes: 1. Laurence-Moon-Biedl syndrome. It is characterised by retinitis pigmentosa, obesity, hypogenitalism, polydactyly and mental deficiency. 2. Cockaynes syndrome. It comprises retinitis pigmentosa, progressive infantile deafness, dwarfism, mental retardation, nystagmus and ataxia. 3. Refsums syndrome. It is characterised by retinitis pigmentosa, peripheral neuropathy and cerebellar ataxia. 4. Ushers syndrome. It includes retinitis pigmentosa and labyrinthine deafness. 5. Hallgrens syndrome. It comprises retinitis pigmentosa, vestibulo-cerebellar ataxia, congenital deafness and mental deficiency. Ref : comprehensive ophthalmology AK khurana 4e page no 269 . 