What is the most common cause of vitreous hemorrhage in diabetic retinopathy?
ANon-proliferative diabetic retinopathy
BProliferative diabetic retinopathy
CSevere non-proliferative diabetic retinopathy
DDiabetic macular edema
Which of the following treatments is not suitable for advanced proliferative diabetic retinopathy with extensive vitreoretinal fibrosis and tractional retinal detachment?
ARemoval of epiretinal membrane
BPhotocoagulation
CVitrectomy
DReattachment of detached or torn retina
Pneumoretinopexy is an outpatient procedure in which retinal detachment is sealed with air insufflation. Which of the following gases is used in pneumoretinopexy?
ANitrous oxide
BOxygen
CSulfur hexafluoride
DCarbon dioxide
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