Abstract
A study was made of patients showing a long horizontal line shadow across a lower zone of the lung. Evidence from morbid anatomical material, the clinical findings, tomograms bronchograms and angiograms suggests that the majority of such long line shadows are related to a vascular and not a bronchial lesion. In some cases an arterial or venous occlusion was found, and the shadow seems to be caused by the thrombosed vessel and surrounding oedema together with some indrawn pleura resulting from the vascular lesion.

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