<prompt> Smoke stake pattern is characteristic of?Sickle cell retinopathySarcoidosisAcute retinal necrosisCentral serous retinopathy  <response>: Ans. is d i.e., Central serous retinopathy Smoke stack pattern small hyper fluorescent spot which ascends vertically like a smoke-stack, which gradually spreads laterally to take a mushroom or umbrella configuration, is a Fundus Fluorescein Angiography FFA finding of Central Serous Retinopathy. Another important FFA finding of CSR is Ink-blot or enlarging dot pattern small hyperfluorescent spot which gradually increases in size. Among these the most common FFA finding is ink-blot pattern. 