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Pathology for Urologists

Scabies


Image A
(click on the image above)

  • Agent: Sarcoptes scabei (human itch mite).
  • Appearance: image A.
  • Clinical: Severe itching that may be worse at night; scaly red patches may be papular, nodular, or excoriated, and are caused by burrowing of the female mite; vesicles may be visible at the end of the burrows.
  • Transmission: prolonged personal contact
  • Histology:
    • Definitive diagnosis requires identification of the mite or its products
    • Demonstration of the eggs containing larvae or of the egg shells (best seen on PAS) is often made.
    • Other findings: epidermal spongiosis (edema) and dermal eosinophils.

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