Practise sizing an aneurysm repair
Measure real and synthetic CT scans, choose a stent graft, and see how close you were.
What the intro shows
- EVAR Sizing: practise the measurements behind an aneurysm repair.
- First, you're asked whether you'd like to join a study of how this skill grows. It's optional.
- Each case is a CT scan: a real, deidentified one, or a synthetic phantom.
- Scroll down through the slices to just below the kidneys, where the neck starts.
- Zoom in and put calipers across the aorta to measure the neck.
- Record all five: the neck's width and length, the widest part of the sac, and both iliacs.
- Then pick a main body and limbs from a maker's sizing table.
- Check your answers: every number against the reference, with stars and points.
- It's free. Join the study and your attempts help show how sizing skill grows over training.
What the how-to shows
- How to measure for an EVAR.
- Scroll down until the lowest renal artery leaves the aorta. The neck starts just below it.
- Measure the neck from outer wall to outer wall, across the short axis if it's oval.
- Thrombus and calcium sit inside the wall, so the outer edge is still the one to measure.
- Mark the lowest renal, then the slice where the aorta first widens by more than 10%.
- Find the widest slice of the sac and measure it outer wall to outer wall.
- Below the bifurcation, measure each common iliac where the limb will seal.
- Then pick the main body from the neck's diameter and each limb from its iliac.
- Check your answers. On Medium, diameters count within 2 mm and the neck length within 5 mm.
- The guide goes through every step with pictures. Start on Easy.
Learn to measure
Where the neck starts, where the calipers go, and how the graft is picked from what you measure. The guide goes through each step with pictures, and says what hospital planning adds.
Read the full guideJoin the study?
This practice is also a study of how EVAR sizing skill develops over training. Joining is optional, practice works exactly the same without it, and you can withdraw at any time.
Checking whether you've joined…
What we're doing
- A free place to practise. Synthetic and real CT scans, every number checked against an answer, and three makers' sizing tables to choose a graft from.
- A study of how the skill grows. With your consent, each attempt is kept under a random id, so we can see how sizing changes from medical school to staff surgeon. It needs ethics approval before anything is published.
- More real scans, checked by residents. Each new scan comes from an openly licensed collection and is measured by a resident, so it has answers to check against.
For practice only. Not for planning a real patient's repair.