A 72-year-old man presented to the emergency department with 3 days of vague abdominal discomfort and increasing right-sided abdominal tenderness. He complained of nausea and had opened his bowels earlier that day. His past medical history included a total extraperitoneal bilateral inguinal hernia repair, dyslipidaemia, gastro-oesophageal reflux disease and previous excision of a giant cell tumour from his left radius, which required a bone graft from his right iliac crest.His abdominal X-ray at presentation revealed a circular opacity in the right upper quadrant consistent with a calcified gallstone and two further opacities in the right lower quadrant which had a similar lamellated appearance (Fig. 1).Computed tomography of the abdomen demonstrated a small bowel obstruction with a large lamellated mass within a Meckel's diverticulum and an associated lamellated mass within the small bowel at the neck of the Meckel's diverticulum: the latter mass was the transition point for the small bowel obstruction (Fig. 2). The right upper quadrant mass was confirmed to be a gallstone present within the gallbladder. As there was no evidence of pneumobilia and the liver function tests were normal, it was reasoned that a gallstone ileus was very unlikely.The patient was consented for laparotomy to manage his mechanical small bowel obstruction. Intra-operatively, a large stone was palpable within the Meckel's diverticulum and a further stone was found within the adjoining small bowel, which appeared to cause the small bowel obstruction (Fig. 3). An enterotomy was performed at the tip of the Meckel's diverticulum and both enteroliths were removed. On macroscopic examination, the enteroliths appeared smooth with a fractured edge, suggesting they were likely a single stone that fractured, with one fragment migrating, causing the small bowel obstruction. The Meckel's diverticulum was resected using a stapler.Apart from an ileus, the patient made an unremarkable recovery and was discharged on post-operative day 8.Histology of the specimen demonstrated a Meckel's diverticulum with acute inflammation, focal perforation and submucosal peridiverticular abscess formation. There was no evidence of heterotopic tissue or malignancy.