376 DISEASES OF THE GASTRO-INTESTINAL TRACT. 



have been a direct implantation of cancer-cells upon the gastric 

 mucosa from a primary lesion above cesophageal, lingual, or 

 facial. 



It rarely occurs before thirty years of age, though in a few 

 instances it has been noted in infants. From the age of fifteen 

 years on, it rapidly increases in frequency, three-fourths of all 

 cases occurring between the ages of forty and seventy years. 



FIG. 169. 



Cancer of the cardiac end of stomach and oesophagus (Warren Museum). 



In women, cancer affects primarily the stomach in 20 to 

 30 per cent, of cases ; aud in men in 40 to 50 per cent. In 

 about one-half the cases the neoplasm is situated at the pylo- 

 rus, the posterior wall and lesser curvature coming next in 

 frequency. 



The position and shape of the stomach are often altered. 



