An unusual case of a giant aneurysm of an aberrant systemic artery supplying a pulmonary sequestration.

A 39-year old gentleman presented with cough and haemoptysis for 5 years. A chest radiograph showed a large left retrocardiac opacity (Fig. 1). A contrast enhanced computerised tomography of the thorax showed a hypertrophied aberrant systemic artery from the descending thoracic aorta, leading to a large saccular, partially thrombosed aneurysm in the left lower lobe (Fig. 2). The patient underwent thoracotomy and diagnosis of a bronchopulmonary sequestration with the aneurysm of the supplying artery was confirmed.