title: Acute pyloric obstruction by gallstone; report of a case diagnosed by gastroscopy.
mesh_terms: D002769:Cholelithiasis / Q000150:complications*; D005773:Gastroscopy; D006801:Humans; D008297:Male; D008875:Middle Aged; D011708:Pylorus; D013277:Stomach Volvulus / Q000175:diagnosis*