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Classifications of three distinct PFO tunnel morphologies
| Type | Septum anatomy | Length of tunnel during cardiac cycle |
|---|---|---|
| Type 1 | Normal | Stable |
| Type 2 | Aneurysmal | Stable (≥4 mm) |
| Type 3 | Aneurysmal | Variable |
Anatomical features of PFO tunnels, classified by Sievert et al. The variability of tunnel length (Type 3) can be a limitation for correct implantation of new “in-tunnel” devices. Data from Sievert H et al. [68].
