Tos Classification - Pars Flaccida Retraction
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👂 Tos Classification of Pars Flaccida Retraction
✅ Stage 1: Mild Retraction
- Minimal dimpling of pars flaccida.
- Not in contact with the neck of malleus.
- Retraction is visible but not adherent.
✅ Stage 2: Contact with Neck of Malleus
- Pars flaccida is retracted and adherent to the neck of the malleus.
- Entire retraction pocket is visible on otoendoscopy.
✅ Stage 3: Partial Erosion of Scutum
- Part of the retraction pocket is out of view.
- There is partial erosion of the bony attic wall (scutum).
- The retraction is deeper and begins to hide in the attic.
✅ Stage 4: Severe Retraction and Erosion
- Severe erosion of the scutum.
- Retraction pocket is deep, not fully visible.
- Complete adherence to surrounding structures.
📝 Summary Table
| Stage | Key Features |
|---|---|
| 1 | Mild retraction, not touching malleus |
| 2 | Adherent to neck of malleus, fully visible pocket |
| 3 | Partial scutum erosion, pocket partly hidden |
| 4 | Severe erosion, deep non-visible pocket |
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