Opticociliary shunt (collaterals) vessels
The disc shows dilated venous loop. Unlike neovascularization,
there are no thin or wispy.

Look for:

  • old central retinal vein occlusion such flamed 

  • haemorrhages, tortous retinal vein or
    panphotocoagulation scars for ischaemiccentral 
    retinal vein occlusion
  • evidence of retrobulbar tumour such as proptosis and choroidal foldings.
  • Questions:

    1. How can you differentiate shunt vessels from neovascularization?

    2. What is the differential diagnosis of opticociliary shunt vessels?

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