Table 1.

The SCENIC consensus for the nomenclature of dysplasia in inflammatory bowel disease using the Paris classification, with modifications to describe ulceration and the borders of the lesion¹⁴

Term	Definition
Visible dysplasia	Dysplasia identified on targeted biopsies from a lesion visualised at colonoscopy
Polypoid	Lesion protruding from the mucosa into the lumen ≥2.5 mm
Pedunculated	Lesion attached to the mucosa by a stalk
Sessile	Lesion not attached to the mucosa by a stalk: entire base is contiguous with the mucosa
Non-polypoid	Lesion with little (<2.5 mm) or no protrusion above the mucosa
Superficial elevated	Lesion with protrusion but <2.5 mm above the lumen (<height of the closed cup of a biopsy forceps)
Flat	Lesion without protrusion above the mucosa
Depressed	Lesion with at least a portion depressed below the level of the mucosa
General descriptors
Ulcerated	Ulceration (fibrinous-appearing base with depth) within the lesion
Border
Distinct border	Lesion’s border is discrete and can be distinguished from surrounding mucosa
Indistinct border	Lesion’s border is not discrete and cannot be distinguished from surrounding mucosa
Invisible dysplasia	Dysplasia identified on random (non-targeted) biopsies of colon mucosa without a visible lesion