A 58-year-old man presents with sudden onset of floaters and flashing lights in his right eye for 2 days, followed by a shadow in the superior temporal field of vision. He is myopic (−8 D) and has a history of posterior vitreous detachment. On examination, visual acuity is 6/9 in the right eye. Dilated fundoscopy reveals a superior temporal retinal fold with a mobile appearance, and the macula appears uninvolved. B-scan ultrasonography confirms a funnel-shaped retinal configuration. What is the most appropriate immediate management?

Explanation

## Clinical Presentation Analysis This patient presents with **rhegmatogenous retinal detachment (RRD)** with the following key features: - **Prodrome:** floaters and photopsia (flashing lights) — classic PVD symptoms - **Macula-off status:** superior temporal shadow indicates macula is still attached - **Funnel-shaped configuration on B-scan:** suggests **total or near-total detachment** with vitreous traction - **High myopia (−8 D):** major risk factor for RRD ## Why Pars Plana Vitrectomy is Correct **Key Point:** A funnel-shaped retinal detachment on B-scan indicates **proliferative vitreoretinopathy (PVR)** or severe vitreous traction, which mandates vitrectomy rather than simpler pneumatic retinopexy. **High-Yield:** Indications for primary vitrectomy in RRD include: - Funnel-shaped detachment (PVR or severe traction) - Proliferative vitreoretinopathy (PVR grade C or higher) - Vitreous hemorrhage obscuring view - Detachment involving multiple quadrants - Inferior detachment (pneumatic retinopexy contraindicated) **Clinical Pearl:** Silicone oil is preferred over gas in this case because: 1. Funnel-shaped detachments often have complex PVR requiring longer tamponade 2. Silicone oil allows better visualization during surgery and post-op follow-up 3. Gas would require strict head positioning (prone) for weeks, which is impractical in a funnel detachment ## Why Other Options Fail | Option | Reason for Rejection | |--------|----------------------| | Gas tamponade + prone positioning | Appropriate only for **simple RRD** with single break in superior/temporal quadrant and NO PVR. Funnel-shaped detachment indicates PVR — gas alone will fail. | | Laser photocoagulation | Laser demarcation is **palliative only** — it does NOT reattach the retina. Used in demarcation of old, stable detachments, not acute management. | | Observation with bed rest | **Contraindicated** — any RRD is a surgical emergency. Waiting risks further detachment, PVR progression, and macula involvement. | ## Surgical Approach Summary ```mermaid flowchart TD A[Rhegmatogenous RRD]:::outcome --> B{B-scan findings?}:::decision B -->|Flat/Mobile retina| C[Simple RRD]:::outcome B -->|Funnel-shaped| D[PVR or severe traction]:::outcome C --> E{Macula status & quadrants?}:::decision E -->|Macula-on, single quadrant| F[Pneumatic retinopexy ± laser]:::action E -->|Macula-off or multiple quadrants| G[Vitrectomy + gas/oil]:::action D --> H[Pars plana vitrectomy + silicone oil]:::action H --> I[Reattachment + PVR management]:::outcome ``` [cite:Parson's Diseases of the Eye 22e Ch 12]