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ENT · Nose: multiple magnet ingestion
Sample itemA 4-year-old swallowed two small magnets a day ago and is now vomiting with abdominal pain. A radiograph shows two metallic densities apart from each other. Why is this urgent?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Magnets in separate bowel loops attract through the walls and cause pressure necrosis, perforation or fistula
A single magnet usually passes, but multiple magnets can attract across loops of bowel, trapping the wall and causing necrosis, perforation, fistula or volvulus. Magnets in the oesophagus or stomach need prompt endoscopic removal and those beyond reach need surgical review.
Option by option
A. They cause only dental problems
The risk is gastrointestinal, not dental.
B. Magnets in separate bowel loops attract through the walls and cause pressure necrosis, perforation or fistula (correct)
Correct. Attraction across bowel walls causes ischaemic injury.
C. They always pass spontaneously and need no review
Several magnets are an emergency and cannot be left.
D. They dissolve in gastric acid
Magnets do not dissolve.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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