대한흉부영상의학회 Korean Society of Thoracic Radiology

Discussion

Diagnosis With Brief Discussion

Diagnosis

Pulmonary Sequestration

Radiologic Findings

Brief Review

Bronchopulmonary sequestration is a congenital pulmonary malformation in which a portion of pulmonary tissue is detached from the remainder of the normal lung and receives its blood supply from a systemic artery. Intralobar sequestration is more common than extralobar type in which the seqestered pulmonary parenchyma is enclosed within its own pleural membrane.
Intralobar sequestration: The abnormal tissue derives its arterial supply from the aorta or one of its branches and venous drainage is via the pulmonary venous system, producting a left-to-right shunt. In approximately two-thirds of cases, the sequestered portion of lung is situated in the paravertebral gutter within the posterior bronchopulmonary segment of the left lower lobe; in most others it occupies the same anatomic region of the right lower lobe. The upper lobes are rarely affected. Bilateral sequestration is also very rare. The radiographic appearance is dependent largely upon the volume of lung tissue sequestered, the presence or absence of infection, and the space-occupying nature of the process. Without infection or air-way communication with normal lung, the anormalous tissue appears as a homogenous, sharply-defined, lobulated mass of unit density in the posterior portion of a lower lobe. Calcification within the sequestered tissue is very rare. When infection has resulted in communication with the bronchial tree, the radiographic presentation cosists of an air-containing cystic mass, with or without air-fluid levels.

References

Keywords

Lung, Congenital,