Iron-deficiency anaemia caused by an enterolith-filled jejunal duplication cyst.

Enterogenous duplication cysts are rare, but recognised, developmental anomalies. Duplications in the midgut are the commonest of these rare anomalies with a high proportion of them being found in the jejunum. Enterolith formation within these duplication cysts is uncommon as is heterotopic mucosa giving rise to peptic ulceration. Mode of presentation depends on whether symptoms due to mass effect or gastrointestinal bleeding predominate. We present a case of iron-deficiency anaemia caused by an enterolith-filled jejunal duplication cyst diagnosed at laparotomy and treated by surgical excision and small bowel resection.