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| Vegetation | Other Masses |
|---|---|
| Attached to valve, upstream side | Attached to valve downstream side |
| Mobile, oscillating | Nonmobile |
| Irregular shape | Smooth surface o fibrillar |
| Low reflectance | High echogenicity |
| Associated valvular regurgitation o perivalvular lesions | Absence of valvular involvement |
| High risk of embolization (if size >1 cm) |
