[Unilateral small lung with translucent cystic appearance. Congenital or acquired origin? 2 case reports].

The distinction between congenital or acquired lung disease is often a difficult problem. This is illustrated by case reports on two boys aged 10 and 12. The clinical, pulmonary function and radiological details were very similar in the two cases, suggesting pulmonary hypoplasia. However, the histology seen in the second case, a type of bronchiolitis obliterans and follicular bronchiectasis were among several arguments in favour of acquired pulmonary disease of infective origin. The recorded literature as well as this observation show that certain respiratory viral infections may lead to bronchial and above all bronchiolar damage which can be severe and progressive.