title: [When can one be sure to be certain?].
authors.affiliation: Hôpital Lariboisière, Paris.
authors.forename: O
authors.initials: O
authors.lastname: Chassany
authors.forename: J M
authors.initials: JM
authors.lastname: Segrestaa
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D006801:Humans; D008171:Lung Diseases / Q000175:diagnosis*; D008297:Male; D008481:Mediastinoscopy; D013902:Radiography, Thoracic; D012507:Sarcoidosis / Q000175:diagnosis*; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed