Abstract
This paper deals with the clinical, roentgenographic, and physiologic data on 3 cases of idiopathic unilateral hyperlucent lung. Evidence points to the possibility that this condition may be vascular in origin. Unilateral arterial to end-tidal carbon dioxide tension gradients were noted in 2 of the present cases on the side of involvement, and the gradient was greatest in the case with the greatest vascular impairment. This measure may be of value in evaluating various types of clinical problems and bears further investigation. A review of the literature is furnished to elucidate present concepts on the pathology, etiology, and treatment of this entity.

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