‘Complex’ anatomical features of PFO
| ‘Complex’ anatomical features | No. of patients |
|---|---|
| Long tunnel > = 10mm | 6 |
| Multiple openings in left atrium | 3 |
| Atrial septal aneurysm with septal sway > = 10mm | 5 |
| Thickened septum secundum | 1 |
| High eustachian ridge | 20 |
| Eustachian valve or Chiari network | 11 |