Non-polypoid colorectal neoplasms: Classification, therapy and follow-up

Table 1 Paris classification of superficial colorectal lesions

Polypoid type1	Pedunculated (0-1p)
	Sessile (0-1s)
	Mixed (0-1sp)
Non-polypoid type	Slightly elevated (0-IIa)
	Flat (0-IIb)
	Slightly depressed (0-IIc)
Mixed types	Elevated and depressed (0-IIa + IIc)
	Depressed and elevated (0-IIc + IIa)
	Sessile and depressed (0-1s + IIc)

¹Elevated more than 2.5 mm above the mucosal layer.

Table 2 Categories of pit pattern at the surface of the colonic mucosa

Non neoplastic	I: Normal mucosa
	II: Enlarged regular stellar crypts
Neoplastic, adenomatous	IIIL: Elongated, sinuous crests
	IIIS: Narrowed round and irregular pits
	IV: Branched or gyrus-like crests
Neoplastic, cancer	Vi: Irregular surface
	VN: Amorphous surface

The categories are classified in reference to prediction of histology and treatment decision.

Table 3 Categories of vascular pattern at the surface of colonic mucosa

Non neoplastic	Normal: Well-delineated capillaries surrounding pits opening
	Faint: Poor visibility of capillaries around enlarged pits
Neoplastic, adenomatous	Network: Vessels organized in a large and regular mesh
	Dense: Enlarged vessels of regular size at top of elongated crests
Neoplastic, cancer	Irregular: Enlarged vessels of irregular diameter and diverging directions
	Sparse: Poor distribution of irregular vessels with diverging directions

The categories are classified in reference to prediction of histology and treatment decision.