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During tomography of the major air passages, the radiologist is occasionally surprised by an appearance which is indistinguishable from an intraluminal tumour. In addition to a genuine tumour, one must then consider the possibility of a mucus plug. One can distinguish between these possibilities by repeating the appropriate cuts after the patient has coughed several times. It will then be found that the position or appearance of the mucus plug will have altered, or that it will have disappeared completely. This phenomenom occurs primarily in older patients, or patients unable to cough. We report ten such cases.

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R. Haubrich (1976) described marginal atelectasis of the lower lobes in chest films in patients in bed. Two such patients were studied in detail and a retrospective analysis of examinations of 546 patients carried out in their beds was undertaken. In the first two of these patients it was possible to prove that the so-called marginal atelectases were, in fact, due to skin folds. The retrospective analysis produced a strong correlation between so-called marginal atelectasis and the presence of skin folds. It is concluded that one should not assume the presence of marginal atelectasis until the possibility of a skin fold has been excluded.