Haggitt classification

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Named after the first author Rodger C. Haggitt.

Histological classification of the extent of invasion of pedunculated malignant colorectal polyps.[1] Sessile lesions are classified separately using the Kikuchi classification.[2]

In practice, the classification is difficult to apply as many pedunculated polyps have short stalks that are destroyed during mechanical snaring or diathermy. Also, the cut off between the head/neck and neck/stalk is often arbitrary and subject to inter-observer variability.

Level 0 
Carcinoma in situ or intramucosal carcinoma. Not invasive. (Note: neither term is in use in the UK)
Level 1 
Carcinoma invading through muscularis mucosa into submucosa, but limited to the head of the polyp.
Level 2 
Carcinoma invading the level of the neck of the adenoma.
Level 3 
Carcinoma invading any part of the stalk.
Level 4 
Carcinoma invading into the submucosa of the bowel wall below the stalk of the polyp, but above the muscularis propria.