Slide 1 

Gross:  Linitis plastica carcinoma diffusely infiltrates the entire gastric wall without forming an intraluminal mass.  The wall of the stomach is typically thickened to about 2-3 cm. and has a leathery, inelastic consistency.

Slide 2

Is a low power view of the slide in your class set.  Poorly differentiated carcinoma arises from the mucosa and diffusely infiltrates all layers of the gastric wall. 

Slide 3

This is a higher magnification showing effacement of the lamina propria of the gastric mucosa by adenocarcinoma.