Which neutrophil characteristic is typically observed in IMPA synovial fluid?

Which neutrophil characteristic is typically observed in IMPA synovial fluid?

• A. Degenerate neutrophils
• B. Non-degenerate neutrophils
• C. Lymphocytes
• D. Eosinophils

Answer: (B)

In IMPA, the joint inflammation is sterile, driven by immune-mediated processes rather than infection. The neutrophils present in the synovial fluid are typically intact and morphologically normal, so you see non-degenerate neutrophils. Degenerate neutrophils, on the other hand, are usually associated with septic arthritis where bacterial toxins damage neutrophils, leading to degeneration. Lymphocytes or eosinophils aren’t the defining neutrophil feature for IMPA; they don’t characterize the neutrophilic, sterile inflammatory pattern seen here. So the hallmark observation is non-degenerate neutrophils in IMPA synovial fluid.

In IMPA, the joint inflammation is sterile, driven by immune-mediated processes rather than infection. The neutrophils present in the synovial fluid are typically intact and morphologically normal, so you see non-degenerate neutrophils. Degenerate neutrophils, on the other hand, are usually associated with septic arthritis where bacterial toxins damage neutrophils, leading to degeneration. Lymphocytes or eosinophils aren’t the defining neutrophil feature for IMPA; they don’t characterize the neutrophilic, sterile inflammatory pattern seen here. So the hallmark observation is non-degenerate neutrophils in IMPA synovial fluid.