Teenager being investigated for gastroesophageal reflux

CXR of pH probe
CXR AP shows a catheter which has numerous linear marks along its length projecting within the esophagus which represents a pH probe whose sensor port, which appears as a minus (-) sign, is in appropriate position 3-5 cm above the gastroesophageal junction

The diagnosis was gastroesophageal reflux with a mimic of a nasogastric tube.