Establishment of a standardized rat model of chronic radiation proctitis and preliminary evaluation of its association with tubulin

Table 1 Modified rectoscopic scoring system for rats

Score (point)	Endoscopic feature
Telangiectasia
0	None
1	Scattered isolated vessels
2	Multiple telangiectasias
3	Diffuse telangiectatic networks
Congested mucosa
0	None
1	Mild hyperemia or edema
2	Diffuse hyperemia
3	Contact bleeding
4	Spontaneous bleeding
Ulceration
0	None
1	Single small ulcer or superficial ulcer
2	Multiple small ulcers or confluent patchy ulcers
3	Deep ulcer
4	Deep ulceration leads to fistula or perforation
Stricture
0	None
1	> 2/3 of the diameter of the rectum
2	1/3-2/3 of the diameter of the rectum
3	< 1/3 of the diameter of the rectum
4	Entirely shut
Necrosis
0	None
1	Extensive necrosis