Discussion
Diagnosis With Brief Discussion
- Diagnosis
- Right aortic arch with an aberrant left subclavian artery and Kommerell’s diverticulum
- Radiologic Findings
- Chest PA (Figure 1A) shows right paratracheal bulging shadow with Right side indentation of trachea.
Lateral chest (Figure 1B) shows anterior displacement of trachea with bulging shadow between trachea and descending thoracic aorta.
Chest CT scan (Figure 2A and 2B) shows a right aortic arch and an aberrant left subclavian artery, which arises form the a diverticulum (Kommerell’s diverticulum )at the junction of aortic arch and the descending thoracic aorta. It seems that the aortic arch and the aneurysm cause posterior indentation and anterior displacement of the trachea.
- Brief Review
- In 1936, Kommerell reported an aberrant right subclavian artery arising from the descending thoracic aorta of left aortic arch and associated with persistence of a remnant of the right dorsal aorta. The latter appeared as a diverticulum from which the aberrant right subclavian artery originated. This is known as the diverticulum of Kommerell. An aberrant right subclavian artery with a leftsided aortic arch is the most common of the anomalies involving the subclavian artery (1).
In adults, a right-sided aortic arch cause symptoms of early atherosclerotic changes of the anomalous vessels, dissection, or aneurysmal dilatation with compression of surrounding structures (i.e, dysphagia, dyspnea, stridor, wheezing, cough, choking spells, recurrent pneumonia, obstructive emphysema, or chest pain)(2).
Aneurysm associated with right-sided arch cause rupture or dissection up to 53%. Because of the relative rarity of the condition and the limited information available, rupture cannot be predicted by size. Aggressive treatment may be suggested for aneurysms of 3 cm or greater in diameter. Kommerell's aneurysms associated with a right-sided aortic arch may be repaired through a right thoracotomy and atriofemoral bypass(2).
- References
- 1. Kommerell B. Verlagerung des Oesophagus durcheine abnorm verlaufende Arteria subclavia dextra (Arteria Lusoria). Fortschr Geb Roentgenstr 1936;54:590-5.
2. C.S. Cina` et al. Kommerell’s diverticulum and right-sided aortic arch. J Vasc Surg 2004;39:131-9
- Keywords
- Vascular, Mediastinum, Congenital,