Pleural effusion in rheumatoid arthritis is typically associated with the following features except-
**Core Concept**
Pleural effusion in rheumatoid arthritis (RA) is a complication that occurs due to the inflammatory nature of the disease, which affects the pleura, the two-layered membrane surrounding the lungs. The pleural effusion in RA is characterized by an exudative effusion with a high protein content and a high lymphocyte count.
**Why the Correct Answer is Right**
The pleural effusion in RA is typically associated with features such as a high glucose level in the pleural fluid ( 50% of the total cell count). The presence of rheumatoid factor and anti-citrullinated protein antibodies (ACPAs) in the pleural fluid can also support the diagnosis of RA-related pleural effusion.
**Why Each Wrong Option is Incorrect**
**Option A:** This option might be incorrect if it does not describe a typical feature of RA-related pleural effusion. However, without the actual text, it's difficult to evaluate its correctness.
**Option B:** This option might be incorrect if it describes a feature that is not typically associated with RA-related pleural effusion. However, without the actual text, it's difficult to evaluate its correctness.
**Option C:** This option might be incorrect if it describes a feature that is typically associated with other types of pleural effusions, not RA-related pleural effusion.
**Clinical Pearl / High-Yield Fact**
A high glucose level in the pleural fluid is a characteristic feature of RA-related pleural effusion, which can help differentiate it from other types of pleural effusions.
**Correct Answer: A.**