Thoracic Endovascular Aneurysm Sealing of a Complex Thoracoabdominal Aneurysm

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Purpose: To report bailout treatment of a thoracoabdominal aortic aneurysm using a single Nellix stent and parallel stents. Case Report: A 74-year-old man with multiple comorbidities and a previous fenestrated Anaconda stent-graft for a 60-mm juxtarenal aneurysm was diagnosed with a type IV thoracoabdominal aneurysm on the 2-year computed tomography angiography (CTA) scans. The imaging showed >10-mm downward migration of the proximal Anaconda stent with a massive type Ia endoleak and aneurysmal evolution of the distal descending thoracic aorta; the superior mesenteric artery (SMA) and renal artery covered stents were patent and intact. Open conversion or a second custom-made endograft was not feasible. A plan was devised to use off-the-shelf materials, including the deployment of a single Nellix stent extending from the descending thoracic aorta into the stented area of the fenestrated endograft, with parallel chimney stent-grafts into the SMA and right renal artery; the left renal artery was treated with a bare stent in a periscope configuration. Transient paraparesis was resolved with cerebrospinal fluid drainage. At 6-month CTA, ongoing aneurysm exclusion with patent SMA and renal arteries was confirmed. Conclusion: Thoracic endovascular aneurysm sealing with visceral and renal stenting seems to be a feasible bailout alternative treatment for urgent, complex cases without reconstruction options.

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