Gass-Blodi_classification

IJRT : idiopathic juxtafoveolar retinal telangiectasis の分類として1993年Gass等が提唱したもの Ophthalmology. 1993

２００６年にYannuzziらが提唱した分類についてはidiopathic macular telangiectasiaの項を参照

Group 1

1A visible and exudative IJRT

1B visivle, exudative, and focal IJRT

Group 2

2A occult and nonexudative IJRT

stage 1

occult telangiectatic vessels

stage 2

loss of transparency without clinically evident telangiectatic vessels

stage 3

prominent dilated right-angle retinal venules

stage 4

retinal pigment hyperplasia into the retina

stage 5

SRN (subretinal neovascularization) from proliferation of intraretinal capillaries

2B juvenile occult familial IJRT

Group 3

3A occlusive IJRT

3B occlusive IJRT with CNS vasculopathy