<prompt> Disc oedema is seen in:CRVOCRAOBRVOBRAO  <response>: Ans. a CRVORef: Parsons 22e, p. 350Swollen optic disc or disc oedema - causesUnilateralPapillitis or optic neuritis involving the nerve head sudden loss of vision with subsequent improvement young ageAnterior ischaemic optic neuropathy sudden loss of vision usually without improvement old ageOrbital tumours slowly progressive visual lossPapillophlebitis or optic disc vasculitis rapid loss of vision without improvementCentral retinal vein occlusionQ may or may not be associated with profound visual impairmentInfiltrative disorders impaired visionOcular hypotony rapid loss of vision without improvementFoster-Kennedy syndrome true papilloedema in one eye with optic atrophy in the fellow eyePseudo Foster-Kennedy syndromePosterior uveitis and scleritisBilateralIncreased intracranial pressure: papilloedema optic nerve function is typically normalHypertension optic nerve function is typically normalDiabetic papillopathy mild-to-moderate impairment of visionCavernous sinus thrombosisCarotid-cavernous fistulaLeber hereditary optic neuropathy in the acute stageOther systemic diseases such as anaemia and hvpoxaemia 