Abdominal aortic aneurysm neck morphology: proposed classification system.

Area of Science:

• Vascular Surgery
• Medical Imaging
• Biomedical Engineering

Background:

• Previous research on endovascular abdominal aortic aneurysm repair (EVAR) has focused on neck length, angulation, and width.
• Aneurysm neck shape has not been extensively studied in relation to EVAR outcomes.

Purpose of the Study:

• To investigate the impact of abdominal aortic aneurysm (AAA) neck morphology on the success of EVAR.
• To establish a classification system for AAA neck shapes to aid in preoperative assessment.

Main Methods:

• Pre-operative CT scans and graft plans from 70 patients undergoing EVAR were analyzed.
• Aneurysm necks were categorized into six distinct shapes: flared, parallel, irregular, conical, barrel, and hourglass.
• Study endpoints included mortality, Type I endoleak, and graft migration.

Main Results:

• The most common neck shapes were flared (46%) and parallel (34%).
• Irregular, conical, barrel, and hourglass shapes were less frequent (9%, 6%, 3%, and 3%, respectively).
• Over a mean follow-up of 20.2 months, there was one Type I endoleak, one graft migration, and no aneurysm-related deaths.

Conclusions:

• Aneurysm neck morphology assessment should be a standard part of preoperative planning for EVAR.
• Implementing a classification system for AAA neck shapes can enhance surgical planning and potentially improve patient outcomes.