[Thoracical circular focus opacities--a problem of differential diagnostics (author's transl)].

Reported on tumourlike circular focus opacities in the thoracic X-ray photogramms of 34 patients, 27 of them were discovered by mass x-ray surveys. They include: 13 organoid tumours, 1 bronchial adenoma, 2 mucodermoid, 1 cystic adenocarcinoma of bronchus, 1 fibroma, 1 reticulo-cytoma, 1 bronchial papilloma, 7 cystic tumours, partially located in the mediastinum, 3 intrapulmonary malformations of blood vessels, 1 mediastinal neurinoma, and 3 cases with suspicion of organoid tumours. 29 patients had to undergo an operation. Finally the authors give a review of literature of indication for surgical treatment, and they represent guidelines for the medical expert assessment fitness for the National Service.