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Digital Case Challenge: Enterobius vermicularis (Pinworm)

Posted Dec 06 2010 1:29pm

The day before the (U.S.) Thanksgiving, I saw this case.  It was identified as simply "colon biopsy" but the pathology assistant noted white thready "mucosal" fragments measuring about 4 mm to 5 mm in length.

The ova are usually described as being about 30 X 50 microns but I think these are slightly smaller due to formalin fixation and routine processing, while this diagnosis is usually made by the "Scotch tape" technique pressed onto perianal skin.  Uncommon as a colonoscopic specimen.  This parasite is transmitted by a fecal-oral route and does not require an intermediate host.  Didn't obviously want to post this around the holiday.

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