title: Unilateral absent lung ventilation and perfusion due to a hilar mass.
abstract: A 54 year old man was referred to us from his private physician for ventilation-perfusion lung scan. In both scans radiotracer activity was absent in the region of the right lung, while a prior chest X-rays film revealed no remarkable abnormality. Subsequent chest computed tomography revealed a hilar mass compressing the hilar vascular and bronchial area components. This case emphasizes that a hilar mass could induce both bronchial and vascular compression with end result matched ventilation-perfusion defect in the entire lung. The chest X-rays film was normal and the chest computed tomography showed a large hilar mediastinal mass. The differential diagnosis of this case is presented.
authors.affiliation: Nuclear Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran. gholamrezanejhad@razi.tums.ac.ir
authors.forename: Ali
authors.initials: A
authors.lastname: Gholamrezanezhad
authors.forename: Mohammad
authors.initials: M
authors.lastname: Eftekhari
authors.forename: Armaghan
authors.initials: A
authors.lastname: Fard Esfahani
authors.forename: Babak
authors.initials: B
authors.lastname: Fallahi Sichani
authors.forename: Davoud
authors.initials: D
authors.lastname: Beiki
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging* / Q000209:etiology*; D011859:Radiography; D011877:Radionuclide Imaging; D003074:Solitary Pulmonary Nodule / Q000150:complications* / Q000000981:diagnostic imaging*; D014692:Ventilation-Perfusion Ratio