A 6.2 cm Aneurysm With a Hostile Abdomen, a Hostile Neck and a Bad Heart

Rupture risk. Two variables matter here, not one. She is already above any repair threshold (about 5.0 cm in women in most guidelines, 5.5 cm in men), and the 0.9-cm increase in 7 months - roughly 1.5 cm per year - exceeds the 1 cm/year growth rate that independently predicts rupture. Diameter and growth rate act multiplicatively; a 6.2-cm sac that is actively expanding carries a much higher annual rupture risk than a static 5.5-cm sac. Observation is not a defensible option and she should be told so plainly.

Timing. She is asymptomatic, so this is not an emergency tonight, but it is weeks, not months. The interval exists to optimize her, not to postpone care.

Competing risks.

• Open repair: three prior laparotomies with midline mesh make a transperitoneal approach dangerous, but the hostile portion is anterior only - a left retroperitoneal (flank) exposure avoids the adhesions entirely. Against this is her physiology: home oxygen for COPD and an eGFR of 32 both markedly elevate open mortality in risk models.
• EVAR: lower 30-day mortality and fewer pulmonary complications, but her anatomy is hostile (see next question), and lifelong surveillance is a real burden with a failing kidney.
• Cardiac: moderate inducible ischemia in stable coronary disease does not mandate prophylactic revascularization before aneurysm repair; it mandates careful perioperative medical therapy, rate control and a cardiology opinion that does not become an indefinite delay.

My decision: proceed to repair within 4–6 weeks after pulmonary and cardiac optimization, with the operative strategy chosen on anatomic and physiologic grounds rather than habit.

Standard bifurcated EVAR generally needs 10–15 mm of infrarenal sealing length, angulation under about 60°, and iliac access of at least 7 mm. She has a 10-mm neck at 80° and 5-mm circumferentially calcified iliacs. Forcing a standard device in invites type Ia endoleak, migration and iliac rupture on delivery.

Options:

1. Open repair via left retroperitoneal approach. Avoids the midline mesh, gives excellent exposure of the infrarenal aorta and both iliacs, and allows supraceliac clamping if needed. Durable, no surveillance burden. Cost: one-lung ventilation, longer recovery, and a real mortality penalty given her COPD and CKD.
2. Aorto-uni-iliac EVAR with an iliac conduit. An 8-mm Dacron conduit sewn to the common iliac or common femoral solves the 5-mm access problem; the contralateral iliac is occluded and a femorofemoral crossover restores flow. Add active fixation and EndoAnchors to reduce type Ia risk in the short angulated neck, and accept a higher reintervention rate.
3. Fenestrated or branched custom device. These require about 15 mm of sealing neck below the renals - she does not have it. A physician-modified endograft could create seal but requires weeks of planning and is unproven in an 80° neck.
4. Chimney/snorkel. Gutter leaks and durability concerns make this a bailout, not a plan.

Choice: if cardiopulmonary assessment says she can tolerate it, a retroperitoneal open repair is the most durable answer to a bad neck and bad iliacs. If not, I would do the AUI-plus-conduit EVAR with adjunctive fixation, consent her explicitly for reintervention and lifelong imaging, and use carbon dioxide angiography with minimal iodinated contrast to protect her kidneys.

This converts an elective problem into a symptomatic, probably infected (mycotic) aneurysm, and the growth of Salmonella in a known 6-cm sac is about as ominous a result as vascular surgery produces. Salmonella has a tropism for atherosclerotic aorta, causes rapid destruction of the wall, and carries a high early rupture rate.

Immediate steps.

• Resuscitate, monitor, and send repeat blood cultures before antibiotics, then start intravenous ceftriaxone plus an aminoglycoside (adjust to local sensitivities and infectious-diseases advice) without waiting for imaging.
• Urgent CT angiography looking for saccular morphology, periaortic soft-tissue stranding, gas, or new enlargement - any of which confirms the diagnosis and defines urgency.
• Do not treat with antibiotics alone; that is a temporizing measure while arranging definitive surgery.

Definitive surgery. Open resection of the infected aorta and all involved tissue with debridement back to healthy margins, followed by either extra-anatomic axillobifemoral bypass through clean tissue, or in-situ reconstruction with a rifampicin-soaked Dacron graft or a cryopreserved homograft wrapped in omentum if the field can be adequately cleaned. She is a poor open candidate, which is precisely the dilemma.

The endovascular question. An endograft in an actively infected field is generally avoided, but in a patient with a hostile abdomen, COPD on oxygen and an eGFR of 32 who is bleeding or unstable, a stent graft plus long-term suppressive antibiotics may be the least-bad bridge. If that route is chosen, be explicit with her and her family that this is suppression, not cure, and that she will need prolonged imaging and probably lifelong oral antibiotics.

Antibiotics. A minimum of 6 weeks of intravenous therapy, often extended to 6–12 months of oral suppression, guided by inflammatory markers and surveillance imaging.