Ductus arteriosus aneurysm
 Discussion of Ductus arteriosus aneurysm
- Aneurysm of the ductus arteriosus is a rare entity in adults
- The ductus arteriosus is a short tubular connection between the left pulmonary artery and aorta. A remnant of the left sixth aortic arch, it normally undergoes physiologic closure soon after birth
- In the few reports of aneurysms involving a patent ductus arteriosus in adults, it is uncertain whether the ductus arteriosus recanalized or original patency persisted.
- Normal closure proceeds from the pulmonary artery to the aortic end. Therefore, when closure is incomplete, the pulmonary side closes and the aortic side remains patent.
- 60% fatality rate due to complications rupture (i.e. dissection, infection, and distal embolization occur)
- Criteria for resection include lesions greater than 3 cm in diameter, symptomatic aneurysms, and any that show progressive enlargement.
 Imaging Findings for Ductus arteriosus aneurysm
 Plain film
- Ductus arteriosus aneurysm maybe perceived as a change in the contour of the aortic arch or aortopulmonary window (adenopathy, neoplasms,or aneurysms related to the aorta itself are certainly more common masses at this site).
- Calcifications at the periphery of the lesion suggesting its vascular nature.
- CT will show the relationship of the aneurysm to the aortic arch and pulmonary artery, while possibly revealing calcifications not detected by plain radiographs.
- The diameter of the lesion and presence of mural thrombus also will be identified.
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 References for Ductus arteriosus aneurysm
- Danza, FM, Fusco, A, Breda, M, Bock, E, Lemmo, G, Colavita, N. Ductus arteriosus aneurysm in an adult. Am. J. Roentgenol. 1984 143: 131-133.
- Romo, LV, Eschelman, DJ. General diagnosis case of the day. Aneurysm of the ductus arteriosus. Am. J. Roentgenol. 1991 156: 1288-1290