
In this condition, the pylorus, the passage that leads from the stomach into the small intestine, is narrow because of a thickening of the muscle. The cause is unknown, and it is more common in boys than in girls.

In this condition, the pylorus, the passage that leads from the stomach into the small intestine, is narrow because of a thickening of the muscle. The cause is unknown, and it is more common in boys than in girls.
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