<prompt> In gastric outlet obstruction in a peptic ulcer patient, the site of obstruction is most likely to be-AntrumDuodenumPylorusPyloric canal  <response>: Bailey writes - The term pyloric stenosis is a misnomer. The stenosis is seldom at the pylorus. Commonly, when the condition is due to underlying peptic ulcer disease, the stenosis is found in the first part of the duodenum, the most common site for a peptic ulcer.Also, knowThere are 2 common causes of gastric outlet obstructionpyloric stenosis secondary to peptic ulcergastric cancerEarlier peptic ulcer was the most common cause, but now the most common cause of gastric outlet obstruction is gastric cancer. 