title: Railroad track sign: a radiographic clue to the cause of pulmonary hypertension.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Separham
authors.forename: Samad
authors.initials: S
authors.lastname: Ghaffari
authors.forename: Leili
authors.initials: L
authors.lastname: Pourafkari
mesh_terms: D003490:Cyanosis / Q000175:diagnosis / Q000209:etiology; D003937:Diagnosis, Differential; D004452:Echocardiography; D004541:Eisenmenger Complex / Q000175:diagnosis* / Q000209:etiology*; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000150:complications* / Q000000981:diagnostic imaging; D008875:Middle Aged; D010004:Osteoarthropathy, Primary Hypertrophic / Q000175:diagnosis / Q000209:etiology; D011859:Radiography