All correlates with USG findings of pyloric stenosis except –: (A) Accuracy 95%, (B) High gastric residue, (C) Segment length > 16 mm, (D) Thickness of pylorus > 4 mm
Answer is B. USG is the imaging modality of choice for evaluation of infantile pyloric stenosis. It is both highly sensitive (90-99%) and specific (95-100%) in the hands of a qualified sonographer.
USG findings of infantile pyloric stenosis are :

               Target sign             - Pyloric muscle wall thickness → > 4mm
               Cervix sign             - Pyloric length (segment length) → ≥ 16mm
               Antral nipple sign    - Pyloric diameter a → ≥ 15mm