"Signet Ring Sign" on Plain X-ray Indicates the Need for Surgical Intervention After Magnet Ingestion in Children.

The ingestion of magnets used in toys and household products is a common problem in children and can have potentially devastating health consequences. The attraction between multiple magnets across intestinal walls can lead to bowel obstruction, fistula formation, necrosis, and perforation of the involved segments. Multiple magnets attached to each other within the intestinal lumen can also pass spontaneously. Clinical and radiological findings help guide the clinician in deciding whether to intervene surgically or follow an expectant management plan. We report the radiological finding of a "signet ring" on a plain abdominal X-ray that was associated with the surgical finding of fistula formation in two patients, who had clinically benign exams after magnet ingestion. This finding on plain abdominal X-rays should warrant operative exploration in children after magnet ingestion.