title: Atypical collapse of the upper lobe of the right lung simulating combined right upper and middle lobe collapse: report of two cases.
abstract: The authors describe two cases of collapse of the upper lobe of the right lung simulating the appearance on plain chest radiographs of collapse of the right upper and middle lobes combined. Computed tomography and bronchoscopy in both cases and surgery in one case showed that the middle lobe was normal. Possible mechanisms for this appearance on plain chest radiographs include the presence of adhesions between the obstructed upper lobe and pleura and the presence of obstructive pneumonia in the upper lobe, preventing typical collapse.
authors: Department of Radiology, Toronto General Hospital, Ontario.
authors: B W
authors: BW
authors: Chong
authors: G L
authors: GL
authors: Weisbrod
authors: S
authors: S
authors: Herman
mesh_terms: D000368:Aged; D001987:Bronchiectasis / Q000000981:diagnostic imaging; D001999:Bronchoscopy; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging*; D000267:Tissue Adhesions / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed