Pars planitis is –
**Core Concept**
Pars planitis is a type of intermediate uveitis characterized by inflammation of the pars plana, a region of the eye between the iris and choroid. This condition often presents with symptoms such as floaters, blurred vision, and eye pain.
**Why the Correct Answer is Right**
Pars planitis is typically associated with the presence of inflammatory cells and exudates in the vitreous and pars plana, which can be visualized on fundoscopic examination. The exact cause of pars planitis is often unclear, but it is thought to be related to an autoimmune response or a reaction to an infectious agent. In some cases, pars planitis may be associated with conditions such as sarcoidosis or multiple sclerosis.
**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because pars planitis specifically refers to inflammation of the pars plana, whereas other forms of uveitis may involve different regions of the eye.
**Option B:**
This option is incorrect because while pars planitis can present with symptoms similar to those of retinitis pigmentosa, the two conditions are distinct and have different underlying causes.
**Option C:**
This option is incorrect because pars planitis typically affects the intermediate uvea, whereas posterior uveitis is characterized by inflammation of the choroid and retina.
**Clinical Pearl / High-Yield Fact**
Pars planitis is often associated with the presence of inflammatory cells and exudates in the vitreous, which can be visualized on fundoscopic examination. This condition requires prompt treatment to prevent complications such as vision loss.
**Correct Answer:** B.