Abstract
Summary 1. Thirteen new cases of unilateral increased radiolucency of the lung (Macleod's syndrome) are reported. 2. Bronchography, bronchospirometry and angiography were carried out in the majority of the cases. 3. All cases were shown to have small pulmonary arteries in the affected area. In 9, lobar arteries were involved, and in 4 the whole artery on one side was affected. 4. In 2 cases the bronchogram was normal. In the remainder the abnormality was not that of typical bronchiectasis. 5. Bronchospirometry showed that the oxygen uptake was reduced considerably more than the ventilation on the affected side. 6. The ˦tiology is discussed. It is thought that the condition may be congenital in origin or that it may be acquired during the growing period. 7. The abnormality does not cause symptoms but it may aggravate breathlessness due to disease in the unaffected lung. 8. The practical significance of the anomaly and its treatment are discussed.
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