General Pathology 601 for Dental Students 

Lab 12
(34) Adenomatous polyp (colon): A polyp is an outgrowth of a mucosal surface (as compared to a papilloma, which is an outgrowth from squamous or transitional epithelium). Polyps are particularly common in the colon. This one is on a long stalk (pedunculated). They sometimes become malignant so that microscopic examination is important. The term adenoma is also used since they are tumors of glandular origin. How might a patient know that he had a polyp?
polyp
   

(35) Adenocarcinoma (colon): This napkin-ring tumor is common in the colon; usually the descending part, and frequently ulcerates, as seen here, and causes melena. These tumors by their encircling growth often cause partial obstruction. Where do they first metastasize? 

 

colon
   

(36) Adenocarcinoma of the stomach: 55-year-old woman with abdominal pain and melena.

 

 
stomach

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Updated March 19, 2014