title: Radioisotope perfusion and ventilation studies in bronchial hilar neoplasia.
mesh_terms: D000368:Aged; D001984:Bronchial Neoplasms / Q000503:physiopathology*; D002294:Carcinoma, Squamous Cell / Q000503:physiopathology*; D006801:Humans; D008297:Male; D011652:Pulmonary Circulation; D012119:Respiration