An Unexpected Finding During Colonoscopy: Pinworms

A 60-year-old physician presented for his outpatient screening colonoscopy. He was asymptomatic and colonoscopy 10 years previously was normal. Routine laboratory tests including a complete blood count with differential were normal. During withdrawal of the colonoscope, white worms, approximately 4 to 5 mm in length, were identified undulating in the ascending colon (Figure A). Laboratory analysis confirmed Enterobius vermicularis (pinworm). The patient was treated successfully with albendazole.

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