myxoma


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  • Types

    • intramuscular myxoma
      • females, 40-70, thigh, butt, shoulder, upper arm
    • juxta-articular myxoma
      • knee (88%), elbow, shoulder, ankle, hip

  • Histology

    • spindle and stellate cells in myxoid stroma, sparse vasculature
    • bland cytology: lack mitosis, necrosis
    • subtypes
      • classic myxoma
      • cellular myxoma
        • increased cellularity and vascularity

  • Stains

    • positive: vimentin
    • variable: CD34, desmin, actin
    • negative: S100
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