Left internal mammary artery access for embolization of the left subclavian artery in a patient with type II endoleak after thoracic endovascular aortic repair for a ruptured right-sided aortic arch aneurysm.

A 65-year-old woman had presented with a ruptured type B intramural hematoma associated with a right-sided aortic arch aneurysm, a large Kommerell diverticulum (KD) and an aberrant left subclavian artery (LSA). She underwent total aortic arch replacement with elephant trunk, thoracic endovascular aortic repair, and LSA ligation distal to the left vertebral artery. She subsequently developed a brisk type II endoleak into the KD via retrograde flow from the left vertebral artery. Percutaneous access of the left internal mammary artery with coil embolization of the proximal LSA and KD was performed. At 5 years, computed tomography angiogram showed complete thoracic aortic remodeling without an endoleak. The results from the present case have illustrated the novel use of the left internal mammary artery as an alternative access for LSA embolization in patients with type II endoleak and limited access options.