X-ray feature of pyloric stenosis is -: (A) Single bubble appearance, (B) Double bubble appearance, (C) Triple bubble appearance, (D) Multiple air fluid levels
Answer is A. The plain XR will show a "single bubble" with air in a distended stomach. An elongated and narrowedpyloric canal (2-4cm in length) results in a "string" sign when a small amount of barium streaks through the pyloric canal