Umbrella configuration on fluorescein angiography is seen in

Fundus fluorescein angiography helps in confirming the diagnosis. Two patterns are seen:_ Ink-blot pattern: It consists of a small hyperfluorescent spot which gradually increases in size._ Smoke-stack pattern: It consists of a small hyperfluorescent spot which ascends veically like a smoke-stack and gradually spreads laterally to take a mushroom or umbrella configuration.Ref: Khurana; 4th edition; Pg.No. 272