Large Bowel.

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Presentation transcript:

Large Bowel

Amoebic Colitis Multiple ulcers Trophozoites with erythrophagocytosis

Amoebic Colitis Complications Perforation Hemorrhage Liver abscess

Ulcerative Colitis After fixation in formalin Gross features of UC Pseudopolyps

Ulcerative Colitis Mucosal acute inflammation (non-specific) Crypt abscess

Ulcerative Colitis : complications Lower GI hemorrhage Toxic megacolon

Diverticular Disease Diverticulitis Diverticulosis

Colonic Polyps Adenomatous Hyperplastic Hamartomatous Retention (juvenile) Inflammatory (pseudo)

Rectal Polyps Hyperplastic polyp Retention polyp (Juvenile polyp)

Colonic polyp Adenomatous polyp

Adenomatous Polyp Tubular adenoma H & E H & E Tubular adenoma

Dysplasia in adenoma

Villous Adenoma

Villous = Hairy Under-water view

Histopathology of villous adenoma H&E tumor VS normal mucosa

Polyposis Coli Early lesions in a case of FAP

Dukes classification of CA rectum

Staging of CA colon Astler-Coller system

Carcinoma of Rectum A-P resection specimen

Carcinoma of Colon H & E Adenocarcinoma Invasive tumor

Tumor necrosis

Tumor infiltration

Lymphatic invasion

Vascular invasion Venous permeation

Nodal metastasis

Metastatic Carcinoma to the Liver