Retinal pigment epithelial step sign: optical coherence tomography clue for diagnosing retained subretinal perfluorocarbon liquid.

Optical coherence tomographic (OCT) features of a retained subretinal perfluorocarbon liquid (PFCL) include an omega-shaped conformation of the cyst, acute angle between the retinal pigment epithelium (RPE) and the neurosensory retina, compressed overlying retinal layers and an RPE hyper-reflective