title: Omega Sign: A Distinct Optical Coherence Tomography Finding in Macular Combined Hamartoma of Retina and Retinal Pigment Epithelium.
abstract: To report a distinct optical coherence tomography (OCT) appearance of macular combined hamartoma of retina and retinal pigment epithelium (CHRRPE).
  
  
  
  This is a retrospective case series of four eyes of four patients with macular CHRRPE who were assessed with the help of color fundus photographs, swept-source OCT (SS-OCT), and fundus fluorescein angiography wherever required.
  
  
  
  All four patients presented with decreased visual acuity. SS-OCT in all patients showed adherent epiretinal membrane (ERM) and localized thickening of underlying retina. An omega-shaped disorganization of inner retinal layers was seen bounded posteriorly by the outer plexiform layer. This was termed, "Omega sign."
  
  
  
  Omega sign is a characteristic feature of macular CHRRPE and may help to distinguish macular CHRRPEs from ERMs. [Ophthalmic Surg Lasers Imaging Retina. 2017;48:122-125.].
authors.forename: Vinod
authors.initials: V
authors.lastname: Kumar
authors.forename: Rohan
authors.initials: R
authors.lastname: Chawla
authors.forename: Koushik
authors.initials: K
authors.lastname: Tripathy
mesh_terms: D000293:Adolescent; D002648:Child; D003937:Diagnosis, Differential; D019773:Epiretinal Membrane / Q000175:diagnosis*; D005260:Female; D005451:Fluorescein Angiography; D005500:Follow-Up Studies; D005654:Fundus Oculi; D006222:Hamartoma / Q000175:diagnosis*; D006801:Humans; D008266:Macula Lutea / Q000473:pathology*; D008297:Male; D012164:Retinal Diseases / Q000175:diagnosis*; D055213:Retinal Pigment Epithelium / Q000473:pathology*; D012189:Retrospective Studies; D013997:Time Factors; D041623:Tomography, Optical Coherence / Q000379:methods*; D055815:Young Adult