title: [Interobserver bias in detecting the penguin-silhouette sign].
authors.forename: J Olivares
authors.initials: JO
authors.lastname: Romero
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008636:Mesencephalon / Q000473:pathology*; D008875:Middle Aged; D015588:Observer Variation; D010300:Parkinson Disease / Q000175:diagnosis / Q000473:pathology; D011149:Pons / Q000473:pathology*; D013494:Supranuclear Palsy, Progressive / Q000175:diagnosis* / Q000473:pathology