Antero-posterior Measurement

The presence of clot within the lumen can lead to errors in measurement.

Incorrect measurement

In this case, the antero-posterior measurement has been incorrectly assessed at 37.1 mm, whereas the aneurysm is actually around 60 mm in diameter.

This is a serious error, as the risk of rupture at 37.1 mm is considerably less than at 60 mm.

Correct measurement

In this case, the antero-posterior measurement has been correctly assessed at 64.9 mm.

Note that the lumen in this case is around 30 mm, and that the mural thrombus appears organised and stable.