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Synovitis Pathology

Plasma Cell Inflammation


Percentage of lymphocytic infiltration, regardless of distribution, that consists of morphologically recognizable plasma cells (Average the percent of all plasma cells over all the inflammation in all fields.)

Magnification: 10x and then 20x to confirm morphology


  • 0: None (69%) Plasma cells < 10% of inflammatory infiltrate
  • 1: Mild (15%): Plasma cells >10% and <50% of inflammatory infiltrate
  • 2: Moderate (16%): Plasma cells >50% of inflammatory infiltrate

Grade 0

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Grade 1a

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Grade 1b

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Grade 2

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