The double track sign is a radiological sign described in pyloric stenosis on various imaging modalities.
Barium study
Double streaks of barium passing through the narrow pylorus 1.
Ultrasound
On fluid aided real-time examination, the pyloric fluid is compressed into smaller tracks as it is impinged upon circumferentially by the thickened circular muscle 2.
Double track sign can also be seen in cases of pylorospasm diagnosed by sonography, therefore it is not pathognomonic for hypertrophic pyloric stenosis 3.
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