Congenital cystic adenomatoid malformation of the lung: hazards of delayed diagnosis.

Congenital cystic adenomatoid malformation is a rare pulmonary developmental anomaly, which typically manifests in neonates and infants. Presentation in adulthood is uncommon, with <60 cases reported in the literature. The majority of cases involve one lobe only. We report a case of type 1 congenital cystic adenomatoid malformation in an adult presenting with a respiratory tract infection and haemoptysis. At thoracotomy, complex cystic masses were noted in the right upper and lower lobes. Lung-sparing surgery, in the form of two segmentectomies and a non-anatomical resection, was performed in order to avoid pneumonectomy. Such presentations may be problematic as potentially incomplete resections may increase the risk of complications and malignant transformation. This suggests the importance of appropriate clinical and radiological follow up.