Endoscopy 2010; 42: E155
DOI: 10.1055/s-0029-1244153
Unusual cases and technical notes

© Georg Thieme Verlag KG Stuttgart · New York

An unusual case of pinworm infection

R.  Araújo1 , A.  Silva1 , J.  Machado1 , A.  Ramalho1 , A.  Castanheira1 , E.  Cancela1 , P.  Ministro1
  • 1Gastroenterology Department, St Teotónio Hospital, Viseu, Portugal
Further Information

Publication History

Publication Date:
16 June 2010 (online)

We report the case of a 45-year-old female, who was observed in a gastroenterology outpatient clinic with a history of abdominal pain and a positive fecal occult blood test. Physical examination was unremarkable. Colonoscopy was performed, and countless pinworms were identified ([Fig. 1], [2]). In the right colon they were observed as a cluster around some feces, resembling a bezoar ([Fig. 3], [4], [5], [Video 1]).

Enterobiasis is the name given to pinworm infection by Enterobius vermicularis. These parasites are nematodes of less than 15 mm in length and which infect the intestine of mammals, particularly primates, including humans. It is the only parasitic disease that is still common today in developed countries, particularly among children. We present this case for its rarity and curiosity of the images collected.

Fig. 1 Pinworm in the sigmoid colon.

Fig. 2 Pinworm near the ileocecal valve.

Fig. 3 Pinworm “bezoar” in the right colon.

Fig. 4 Pinworm “bezoar” in the right colon.

Fig. 5 Pinworm “bezoar” in the right colon.


Video 1 Countless pinworms in the colon.

Competing interests: None


    R. N. C. Araújo, MD 

    Gastroenterology Department, St Teotónio Hospital

    Rua da Mata Mansa 191 3º Posterior
    3500-899 Viseu

    Fax: +351-232-420591

    Email: Ricardocaraujo@gmail.com