Classification of retinal vasculitis by involved vessel

Disease	Primary ocular vessel involved
Polyarteritis nodosa	Macular arteries
Giant cell arteritis	Medium to small arteries
Systemic lupus erythematosus	Small arteries
Whipple's disease	Capillaries
Behçet syndrome; sarcoidosis; multiple sclerosis	Veins
Crohn disease; relapsing polychondritis	Arteries and veins
HLA-B27-associated conditions, such as ankylosing spondylitis	Variable type of vessel involvement or no involvement

HLA: human leukocyte antigen.

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