Multislice CT and CT angiography for non-invasive evaluation of bronchopulmonary sequestration.

Bronchopulmonary sequestration (BPS) is a rare congenital anomaly due to disturbed embryogenesis with a surplus budding of the lungs. BPS has no communication with the bronchial system. In most cases the blood supply of the sequestration is systemic via the aorta. There are two types of BPS: intralobar sequestration without its own pleural covering and extralobar sequestration with a separate pleura. They are clinically manifested in different ways. Sequestration normally occurs in the left lower lobe. The venous drainage often occurs via the pulmonary veins, producing a large shunt volume. The clinical symptoms are caused by recurrence of infection because of extensive therapy resistance, and rarely by haemoptysis.