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A 16‐year old girl was admitted with a 9‐month history of bilious vomiting, colicky central abdominal pain and 3 stone weight loss. There was no previous medical history or psychiatric problems. Blood investigations were normal.
On examination she looked well. Her abdomen was soft and non‐tender. There was a sucussion splash. Abdominal radiograph and gastroscopy were normal. A barium meal follow‐through examination was arranged (fig 11).
What is the cause of this young girl's vomiting?
See page 1598 for answer