**Question:** A most common cause of anterior uveitis associated with arthritis –

*A. Rheumatoid arthritis*
*B. Ankylosing spondylitis*
*C. Reiter's syndrome*
*D. Psoriatic arthritis*

**Correct Answer:** **D. Psoriatic arthritis**

**Core Concept:** Anterior uveitis is a type of uveitis, a group of inflammatory conditions affecting the eye. Anterior uveitis is commonly associated with a group of diseases called "spondyloarthritis," which includes the following conditions:

**Why the Correct Answer is Right:**
Anterior uveitis is a common manifestation in patients with psoriatic arthritis (PsA). PsA is a type of spondyloarthritis characterized by inflammation involving skin, nails, and joints. In addition to uveitis, patients with PsA can also develop enthesitis (inflammation at the attachment sites of ligaments and tendons), dactylitis (swollen fingers or toes), and nail dystrophy.

**Why Each Wrong Option is Incorrect:**

A. Rheumatoid arthritis (RA) is another common cause of uveitis but is typically associated with posterior uveitis, not anterior uveitis. RA is a systemic autoimmune disorder affecting multiple joints and organs.

B. Ankylosing spondylitis (AS) primarily affects the spine and sacroiliac joints, leading to inflammatory arthritis and spinal stiffness. AS is not typically associated with anterior uveitis.

C. Reiter's syndrome (Reiter's) combines uveitis with urethritis and stomatitis. While Reiter's syndrome is a recognized entity, it is less common than PsA and RA in causing anterior uveitis.

**Clinical Pearl:**
PsA is a clinical entity to remember when assessing patients presenting with anterior uveitis and other skin, nail, and joint symptoms. A thorough rheumatologic evaluation is crucial in these cases, as early diagnosis and treatment can prevent long-term complications of uveitis.

**Core Concept:** Spondyloarthritis is a group of inflammatory joint diseases that include conditions like PsA, RA, and AS. These diseases are characterized by inflammation affecting the joints, spine, and sometimes other organs.

**Why Each Wrong Option is Incorrect:**

A. Rheumatoid arthritis primarily involves synovial joints, causing inflammation and joint deformity. It is not typically associated with anterior uveitis.

B. Ankylosing spondylitis affects the spine and sacroiliac joints, leading to spinal rigidity, but not anterior uveitis.

C. Reiter's syndrome combines uveitis with urethritis and stomatitis. Although Reiter's syndrome is a recognized entity, it is less common than PsA and RA in causing anterior uveitis.

**Clinical Pearls:**
1. A thorough rheumatologic evaluation is essential in patients with anterior uveitis, as early diagnosis and treatment can prevent long-term complications of uveitis