Ewing's sarcoma of the duodenum: a rare clinical condition managed with surgical resection.

A man in his 40s with no medical history presented with right-sided abdominal and chest pain. A CT scan of the abdomen demonstrated a 7.7 cm heterogeneous mass arising from the second part of the duodenum. Oesophagogastroduodenoscopy confirmed a malignant-appearing duodenal lesion, with biopsy showing features consistent with small cell carcinoma. The patient underwent three cycles of neoadjuvant chemotherapy, followed by elective Kausch-Whipple pancreaticoduodenectomy. A combination of immunohistochemistry and molecular studies confirmed the diagnosis of a rare Ewing's sarcoma tumour originating from the duodenum with invasion into the duodenal lumen. The patient recovered well from surgery and remains disease-free 18 months following resection.