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1 Pulmonary Disease Service, Department of Medicine, Madigan General Hospital, Tacoma, Washington
The borders of a pulmonary artery are obliterated when the vessel is in anatomic contract with an adjacent alveolar infiltrate. Whenever specific segmental arteries are noted to be so affected, disease can be localized to that particular segment or lobe. Cases of infiltrative processes in the right lower lung field on the posteroanterior roentgenogram are presented illustrating this method of localization.
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