Elevated/polypoid lesions (0-I) are defined as having more than double the amount of mucosal thickness in a histological specimen, while flat lesions (0-II) are less than that [1].

The NICE (NBI International Colorectal Endoscopic) Classification is based on narrow-band images of colon polyps. The classification uses staining, vascular patterns, and surface patterns to distinguish between hyperplastic and adenomatous colon polyps.

We aimed to provide an overview of polyp classification techniques to help surgeons select the correct treatment algorithm for advanced colorectal lesions based on their visual characteristics at index endoscopy. Widespread screening has increased the detection of …

The size of the lesion plays an essential role in polypoid findings (Ip and Is) (although the Paris classification in the general sense only describes lesions less than 2 cm).

Accurate assessment of polyp size is one of the most important factors in determining the risk of cancer in a polyp. While polyp size can be measured easily following resection, open biopsy forceps (of known width) can be used to estimate polyp size endoscopically.

Poor differentiation of cancer in a malignant polyp is an unusual finding but is associated with a high risk of residual disease in the lymph nodes. It is usually associated with other risk factors for residual disease (Level IIb). Recommendations

Type 0 to I lesions are subclassified as type 0 to Ip (pedunculated) and type 0 to Is (sessile) lesions. Type 0 to IIa lesions include those in which the height of the lesion does not exceed 2.5 mm, type 0 to IIb lesions are those that are truly flat, and type 0 to IIc lesions include slightly depressed lesions.

2024年4月11日 · The Paris classification (the most widely validated and accepted system used to describe colorectal polyp morphology in vivo, established by multidisciplinary expert consensus in 2002) is used to categorize superficial tumors based on their shape and classify them morphologically. The classification helps to provide an initial and approximate ...

Polypoid lesions are elevated 2.5 mm or more from the surrounding mucosa — a height conveniently selected as it is the width of closed endoscopic biopsy forceps. Type 0-I is subclassified as 0-Ip (pedunculated), 0-Is (sessile) and 0-Isp (subpedunculated).

• When analysing the data on polyp morphology assessments into just two categories, polypoid (Paris Ip, Isp, Is) vs. non- polypoid (Paris IIa, IIb, IIc, III) the Fleiss kappa remained ‘moderate’ with a kappa of 0.45 (95% CI of