2-year-old girl with a history of reflux.
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pH probe with tip in distal oesophagus.
Normal mediastinal and cardiac contours. Lungs are clear.
Probes measuring oesophageal pH as part of a gastroesophageal reflux workup are not frequently seen on paediatric chest radiographs.
The tip of the probe should be seen in the distal oesophagus (above the gastroesophageal junction).
It is important not to confuse it with a feeding tube.
The probe is connected to a monitor that records acid levels over a 24-hour period.