Rheumatoid Arthritis: Analyzing Statements

The question asks to identify the statement that is NOT true regarding rheumatoid arthritis (RA). Let's analyze each option:

• Option 1: The cricoarytenoid joint may be involved
  Rheumatoid arthritis is known to affect various joints, including less common ones like the cricoarytenoid joint in the larynx. Involvement here can lead to hoarseness. Thus, this statement is considered true for RA.
• Option 2: HLA-D4 and HLA-DR4 are positive in patients with seropositive rheumatoid arthritis
  Specific human leukocyte antigen (HLA) alleles, particularly subtypes of HLA-DRB1 like HLA-DR4 (often written as HLA-D4 or HLA-DR4), are strongly associated with an increased risk and severity of rheumatoid arthritis, especially in seropositive individuals (those with rheumatoid factor or anti-CCP antibodies). This statement is true.
• Option 3: Subcutaneous nodules are more frequent in seronegative patients
  Subcutaneous rheumatoid nodules are characteristic extra-articular manifestations of RA. However, these nodules are typically found more often in patients who are seropositive (RF-positive or anti-CCP positive) rather than seronegative. Therefore, this statement is false.
• Option 4: Diffuse intestinal fibrosis and pneumonitis may occur
  Rheumatoid arthritis is a systemic disease that can affect organs beyond the joints. Lung involvement, such as interstitial lung disease and pneumonitis, is a well-documented extra-articular manifestation. While diffuse intestinal fibrosis is less common, the potential for systemic and pulmonary involvement makes this statement plausible and generally considered true in the context of RA's systemic nature.

Conclusion on Rheumatoid Arthritis Statements

Based on the analysis, the statement that is factually incorrect regarding rheumatoid arthritis is that subcutaneous nodules are more frequent in seronegative patients. These nodules are more commonly associated with seropositive RA.