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Large-bowel obstruction secondary to Enterobius vermicularis pseudotumour
  1. Stephen O'Brien1,
  2. Sami Ahmed1,
  3. Brian Hayes2 and
  4. Michael O'Riordain1
  1. 1Department of Surgery, Mercy University Hospital, Cork, Ireland
  2. 2Department of Histopathology, Cork University Hospital, Cork, Ireland
  1. Correspondence to Dr Stephen O'Brien; stephenobrien{at}


Enterobius vermicularis infection is typically observed in paediatric patients and manifests with perianal pruritus, but other manifestations or ectopic presentations have been reported in the literature. We present the case of a man in his 60ss with a large-bowel obstruction with symptoms including a 4-day history of progressive abdominal pain, distension, vomiting and absolute constipation. On examination, his abdomen was distended with tinkling bowel sounds on auscultation. Cross-sectional imaging demonstrated an obstructing mass in the distal descending colon. An emergency laparoscopic Hartmann’s procedure was performed and the patient made an uneventful recovery. An intraoperative colonoscopy demonstrated numerous white threadworms in the colon. Histological analysis demonstrated a pseudotumour related to Enterobius vermicularis infection. This case represents a rare differential diagnosis for a large-bowel obstruction.

  • Gastrointestinal surgery
  • General surgery
  • Hepatitis and other GI infections
  • Infection (gastroenterology)

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  • Contributors Study design and concept (SO’B, SA, BH and MO’R), data collection and analysis (SO’B, SA, BH and MO’R), manuscript preparation and editing (SO’B, SA, BH and MO’R), approval of final version for submission SO’B, SA, BH and MO’R).

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Case reports provide a valuable learning resource for the scientific community and can indicate areas of interest for future research. They should not be used in isolation to guide treatment choices or public health policy.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.