[Surgical treatment of hyperplastic inborn failures of the lung (author's transl)].

A very rare hyperplastic inborn failure regarding construction of the lung is the accessory lung. It will be reported of an accessory lung in the left mediastinum (without connection to the bronchial system) and of a trachea-accessory lung (with connection to the bronchial system). Both cases had caused symptoms which required a surgical elimination of the accessory tissue. In the first case the left lung had been displaced due to the production of secretion - formation cyst. In the second case the unsufficient secretion flow off had caused repeated pneumonia and formation of bronchiectasis.