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Benign Adenoma - Adenomatous Polyp of the Colon - Benign 

Note that the mucosal cells have undergone massive proliferation. However, they remain in their normal though expanded arrangement, remain attached to one another and therefore form a benign tumor.  Compare the thickness of the adenoma mucosa with that of the short piece of normal mucosa.  

                                        Adenomatous polyp (40X1.6)
                                          
                                        Normal mucosa (thin dark layer) at right, neoplasia (very thick 
                                        dark purple layers) at left 

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Copyright 2020: Augustine G. DiGiovanna, Ph.D., Salisbury University, Maryland

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