title: Hemi-central retinal vein occlusion. Pathogenesis, clinical features, natural history and incidence of dual trunk central retinal vein.
abstract: It has been shown that dual trunk central retinal vein (CRV) occurs in 20.3 per cent of a normal population. Confirmatory evidence has been produced by the results of anatomical, histological and micro-dissection studies. Occlusion of the single trunk of such a vein in its retrolaminar, or intraneural part, would result in a venous occlusion affecting one-half of the retina similar to that of branch retinal vein occlusion (BRVO). Yet this should be regarded as a variation of CRVO. Visual prognosis seems to be better in hemi-central retinal venous occlusion than in total CRVO. The site of development of collateral gives a clue to the site of the occlusion. Therefore, it is suggested that hemi-CRVO is a distinct entity and should not be confused with so-called hemi-spherical vein occlusion which is a variation of BRVO.
mesh_terms: D000368:Aged; D003097:Collateral Circulation; D003251:Constriction, Pathologic; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012164:Retinal Diseases / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D012169:Retinal Vein / Q000002:abnormalities / Q000473:pathology; D014794:Visual Fields