A rare case of abdominal pain caused by Enterobius vermicularis.

Small bowel involvement of Enterobius vermicularis infection is exceptionally rare, with few cases reported. A female presented with persistent abdominal pain for one month. Gastroscopy and colonoscopy were unremarkable, but computed tomography revealed localized small bowel wall thickening. Laboratory tests showed elevated eosinophil counts, though parasite antibody screening was negative. Double-balloon enteroscopy identified multiple shallow ulcers and a live worm in the small intestine, confirmed as Enterobius vermicularis on pathological examination. The patient was treated with anthelmintic therapy, and her symptoms resolved without recurrence.