Abstract:

Enterobius vermicularis, also known as pinworm, is one of the most common nematode infections worldwide. Enterobiasis typically presents as itching around the anus. Eggs are deposited peri-anally and may be transferred to other surfaces such as hands, toilets, or bedding. Infection occurs via ingestion of eggs that hatch in the small intestine with the eventual migration of adult forms to the anus. E. vermicularis has rarely been identified in non-gastrointestinal locations such as the lung, soft tissue, and kidney. We describe a case of enterobiasis, clinically thought to be a chalazion, involving the right eyelid/conjunctiva of a 7-year-old girl recently treated for pinworm infection. A 7 x 4 mm excision of the conjunctival mucosa was performed. Microscopically, innumerable pinworm eggs and multiple adult worm body segments were identified with an accompanying granulomatous and chronic inflammatory reaction. Identification of pinworm is critical as further treatment with anti-parasitic medications is warranted. Re-infection with E. vermicularis is not uncommon and treatment for members of the household should be considered in cases of repeated infections.

Financial Disclosure:
No current or relevant financial relationships exist.

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Stanton Miller, MD

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