In sympathetic ophthalmitis, Dalen-Fuch’s nodules are formed on the:
**Core Concept**
Sympathetic ophthalmitis is a rare, bilateral granulomatous inflammation of the eyes, following a penetrating injury to one eye. It involves an autoimmune response against **uveal antigens**. The condition is characterized by the formation of specific inflammatory lesions.
**Why the Correct Answer is Right**
Dalen-Fuchs nodules are collections of **epithelioid cells** and **lymphocytes** between the **retinal pigment epithelium** and **Bruch's membrane**. They are a hallmark of sympathetic ophthalmitis, representing a localized immune response. The formation of these nodules is a result of the autoimmune reaction against **uveal proteins**.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because Dalen-Fuchs nodules are not typically associated with the sclera.
**Option B:** Incorrect as these nodules are not characteristic of the choroid alone.
**Option C:** Incorrect because while the retina is involved, the specific location is more precise.
**Why Each Wrong Option is Incorrect (continued)**
**Option D:** This is the correct location, but the other options need to be addressed for completeness.
**Clinical Pearl / High-Yield Fact**
Sympathetic ophthalmitis is a medical emergency, requiring prompt treatment to prevent vision loss in the unaffected eye. **Early enucleation** of the damaged eye may prevent the syndrome.
**Correct Answer:** D. Between the retinal pigment epithelium and Bruch's membrane, Dalen-Fuchs nodules are formed in sympathetic ophthalmitis.