**Core Concept**
Seronegative spondyloarthropathies (SpA) are a group of inflammatory diseases characterized by the absence of rheumatoid factor (RF) and/or anti-citrullinated protein antibodies (anti-CCP) in the serum. These conditions primarily affect the axial skeleton, peripheral joints, and extra-articular structures, with a strong association with human leukocyte antigen (HLA)-B27.

**Why the Correct Answer is Right**
Seronegative spondyloarthropathies include conditions such as ankylosing spondylitis (AS), psoriatic arthritis (PsA), reactive arthritis (ReA), and enteropathic arthritis (EA). These diseases share common features, including:
- **Axial involvement**: Inflammation of the spine, sacroiliac joints, and other axial structures.
- **Peripheral arthritis**: Inflammation of the peripheral joints, often asymmetric and oligoarticular.
- **Enthesitis**: Inflammation of the sites where tendons or ligaments insert into bone.
- **Dactylitis**: Inflammation of an entire digit or toe.
- **Extra-articular manifestations**: Skin, eye, and gastrointestinal involvement.

**Why Each Wrong Option is Incorrect**
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**Clinical Pearl / High-Yield Fact**
In seronegative spondyloarthropathies, the presence of HLA-B27 is a strong risk factor, but not all individuals with HLA-B27 will develop the disease. Conversely, not all patients with seronegative SpA will test positive for HLA-B27.

**Correct Answer:**
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