Table 1.

Lewis Score.

	Number	Extent	Descriptors
Villous appearance (worst-affected tertile)	Normal – 0	≤10% – 8	Single – 1
	Oedematous – 1	11–50% – 12	Patchy – 14
		>50% – 20	Diffuse – 17
Ulcer (worst-affected tertile)	None – 0	≤10% – 5	<1/4 – 9
	Single – 3	11–50% – 10	1/4–1/2 – 12
	2–7 – 5	>50% – 15	>1/2 – 18
	≥8 – 10		(percentage of the frame occupied by the largest ulcer) ocupada
Stenosis (whole study)	None – 0	Non-ulcerated – 2	Traversed – 7
	Single – 14	Ulcerated – 24	Not traversed – 10
	Multiple – 20

Lewis Score = tertile with highest score (resulting of oedema and ulcers) plus score of stenosis for the entire small bowel.