K A Hawken

Double pylorus--in evolution.

Double pylorus is a rare abnormality. Over a 4-year period, we have found two cases of double pylorus in 2,500 endoscopic examinations, an incidence of 0.08%. In one patient, the development of double pylorus from a prepyloric ulcer was followed by serial endoscopies. Most cases of double pylorus are acquired from peptic ulcer disease.