Investigation of choice to diagnose hyperophic pyloric Stenosis in infants is: (A) Contrast radiology, (B) Gastroscopy, (C) Ultrasound abdomen, (D) CT scan abdomen
Answer is C. Ultrasonography is recommended because its sensitivity and specificity are close to 100% for this disease. Ultrasound is reliable and easily performed and has replaced barium studies as the main investigation.There is a normal variation of pylorus muscle measurements with age and gestation but ultrasound has a very high sensitivity and specificity.