BACKGROUND: Macroaneurysms can represent common consequences of branch @entity2994 (BRVO). The aim of the present study is to evaluate the clinical and angiographic aspects of 31 cases of branch @entity2994 (BRVO) in which @entity2479 developed, in an attempt to analyze their pathogenic features. METHODS: One hundred and sixty-one consecutive @entity1 affected by BRVO were considered. Each @entity1 underwent an opthalmological examination including @entity941 angiography, at an average interval of two months (range: 1-4 months) from the onset of the disease, with a mean follow-up of 43 months (range: 32-56 months). The macroaneurysms were subdivided according to size into small (from 100 to 149 microns), medium (from 150 to 249 microns), and large (greater than 250 microns), and according to origin into arterial, venous, capillary and collateral-associated. RESULTS: Thirty-one @entity1 (19.3%) developed @entity2479 . The total number of detected macroaneurysms was 51; ten (19.6%) were large, 21 (41.2%) were of medium-size and 20 (39.2%) were small in dimension. Three lesions were of arterial origin, 22 were capillary and 26 were from collateral vessels. In 27 @entity1 (87.1%) the lesions were located outside the macular region, and in 4 @entity1 (12.9%) in the macular region. @entity1 with @entity2479 did not show a different prevalence of capillary non-perfusion when compared with others. With regard to the number of @entity989 @entity1 with macroaneurysms developed fewer than other @entity1 , and the difference was statistically significant (p < 0.001). CONCLUSION: The insufficient number of @entity989 can be considered the most contributory factor in the development of macroaneurysms secondary to BRVO.

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@entity1 :: ('9606', 'Species') :: ['Patients', 'patients', 'patient'] @entity2479 :: ('MESH:D012173', 'Disease') :: ['retinal macroaneurysms'] @entity2994 :: ('MESH:D012170', 'Disease') :: ['retinal vein occlusion', 'retinal vein occlusions'] @entity941 :: ('MESH:D019793', 'Chemical') :: ['fluorescein'] @entity989 :: ('MESH:D012164', 'Disease') :: ['retinal venous collaterals']
@entity2994 :: (MESH:D012170,Disease) :: ['Branch retinal vein occlusion']
