Infantile abdominal aortic aneurysms are rare, usually detected incidentally, and associated with connective tissue disease or due to iatrogenic causes. The diagnosis should be considered when a large cystic mass (especially pulsatile) is found in a neonate and confirmed using color and duplex sonography. Undiagnosed aneurysms have a high mortality rate. Surgical treatment is warranted when the patient is stabilized and may result in a normal outcome, although future graft replacement may be necessary.
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