Discussion
Diagnosis With Brief Discussion
- Diagnosis
- Bilateral Pulmonary Sequestration with Bridging Isthmus
- Radiologic Findings
- A CT scan showed the presence of multicystic masses in medial basal segments of bilateral lower lobes with midline bridging isthmus. The lesions received the blood supply from an aberrant artery, a branch of the abdominal aorta. On volume rendering reconstructed image, there are multiple feeders originated from the ascending aorta.

Figure 6.
- Brief Review
- Pulmonary sequestration is a relatively rare disorder, and is defined as a segment of the lung parenchyma that lacks communication with the tracheobronchial tree and receives an aberrant systemic arterial blood supply. The anomaly can be either intralobar or extralobar (1). Bilateral pulmonary sequestration is a rare anomaly (2).
The presence of a bridging isthmus between bilateral pulmonary sequestrations is extremely rare (3). Bilateral pulmonary sequestrations with a bridging isthmus may mimic a horseshoe lung. A horseshoe lung is formed from the joining of bilateral lung bases by an isthmus of lung parenchyma behind the heart. The arterial supplies to the isthmic portion of a horseshoe lung are almost always the branches from the pulmonary artery (4, 5). Most of the reported cases have been associated with a certain degree of pulmonary hypoplasia (6). The feeding artery of the mass in our case turned out to be an aberrant arterial branch from the abdominal aorta.
- References
- 1. Son RC, Lee JK, Hwang MS. Bilateral pulmonary sequestration with a bridging isthmus in an elderly person: A case report. J Korean Soc Radiology 2009;61:105-107.
2. Carrion-Valero F, Marin-Pardo J. Pulmonary sequestration. Respiration 2003;70:528.
3. Srikanth MS, Ford EG, Stanley P, Mahour GH. Communicating bronchopulmonary foregut malformations: classification and embryogenesis. J Pediatr Surg 1992;27:732-736.
4. Kuo R, Shih SL, Huang JK. On the AJR digital viewbox. Bilateral pulmonary sequestration with bridging isthmus in a boy with Williams syndrome. AJR Am J Roentgenol 2006;187:W133-134.
5. Figa FH, Yoo SJ, Burrows PE, Turner-Gomes S, Freedom RM. Horseshoe lung-a case report with unusual bronchial and pleural anomalies and a proposed new classification. Pediatr Radiol 1993;23:44-47.
6. Hawass ND, Badawi MG, Fatani JA, Meshari AA, Edrees YB. Horseshoe lung with multiple congenital anomalies. Case report and review of the literature. Acta Radiol 1987;28:751-754.
7. Lutterman J, Jedeikin R, Cleveland DC. Horseshoe lung with left lung hypoplasia and critical pulmonary venous stenosis. AnnThorac Surg 2004;77:1085-1087.
- Keywords
- lung, congenital,