## Retinal Breaks in Rhegmatogenous Detachment **Key Point:** Horseshoe (or U-shaped) tears are the most common retinal breaks associated with posterior vitreous detachment (PVD) and carry the highest risk of progression to total detachment. ### Types of Retinal Breaks | Break Type | Mechanism | Association with PVD | Risk of RD | Location | | --- | --- | --- | --- | --- | | Horseshoe tear | Vitreous traction at the edge of a vitreous base detachment | **High** | **Highest** | Equatorial or pre-equatorial | | Atrophic hole | Vitreous degeneration without traction | Low | Low | Posterior pole or flat retina | | Dialysis | Retinal separation at the retinal base | Moderate | Moderate | Retinal periphery (ora serrata region) | | Macular hole | Central retinal defect | Variable | Lower initially | Foveola | ### Why Horseshoe Tears Are Most Common with PVD **High-Yield:** During posterior vitreous detachment, the vitreous gel separates from the retina. At points of strong vitreoretinal adhesion (lattice degeneration, retinal scars), the vitreous pulls the retina tangentially, creating a horseshoe-shaped tear. The free edge of the tear allows rapid vitreous fluid ingress beneath the retina. **Clinical Pearl:** A horseshoe tear is a **red flag** for imminent or progressive retinal detachment. Urgent laser or cryotherapy is indicated even if detachment has not yet occurred, because the risk is very high (up to 50% will develop RD within weeks if untreated). **Mnemonic: "Horseshoe = High Risk"** - **H**igh traction from PVD - **I**mmediate risk of detachment - **G**ap allows vitreous fluid entry - **H**urgent treatment needed [cite:Boyd & Malone Retinal Diseases 6e Ch 3] 
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