Low power: DQ stain
Cellular sample with abundant neutrophils together with histiocytes and mesothelial cells
High power: DQ stain
Benign effusion with acute inflammation
High power: Pap stain
Abundant neutrophils together with histiocytes and mesothelial cells in a benign effusion
Features
Cellular features
• Usually cellular sample
• Numerous polymorphonuclear leukocytes
• Bacteria may be present
Notes
• Acute inflammation associated with effusions are seen in cases of infection, typically bacterial infection, or in response to an injury or inflammation. Sometimes acute inflammation is seen in association with malignant effusions.