[Syndrome of the unilateral or partially "hyperlucent lung"]

The paper presents the picture of the unilateral or partial "hyperlucent lung" syndrome. The most common causes of this anomaly are described according to pathological and anatomical criteria. The difficult diagnosis of its X-ray-appearance is discussed. The value of differential diagnostic criteria is demonstrated in suitable cases. Differentiation from the pseudo-syndrome is also outlined. Various methods of radiological examination are described and evaluated.