THE MUCOUS membrane in the pyloric region of the stomach may prolapse through the pylorus and thereby cause gastric pains and vomiting. Such a prolapse of the gastric mucosa is generally due to the presence of a stalky tumor, but in rare cases it is caused exclusively by an abnormal redundance and laxness of the mucous membrane in the pyloric region of the stomach.
Schmieden1 seems to have been the first to describe a case of this kind. The patient was a woman, aged 27, with dyspeptic symptoms. At operation on the pyloric region of the stomach, he found a transverse fold of mucous membrane, which he thought could shut off the access to the pylorus in the manner of a valve. More recently cases have been reported by Eliason, Pendergrass and Wright,2 Meyer and Singer,3 Pendergrass and Andrews,4 Rees,5 Bohrer and Copleman,6 and
ZACHO A. RELAXATION OF THE GASTRIC MUCOSA PRODUCING PYLORIC OBSTRUCTION. Arch Surg. 1948;57(1):45-50. doi:10.1001/archsurg.1948.01240020048005