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
