Colonoscopic evaluation of minimal rectal bleeding in average-risk patients for colorectal cancer

Table 2 Location of significant lesions according to the reach of different diagnostic procedures¹ in patients with minimal bright red bleeding per rectum at Loghman Hakim hospital

Distance from anal verge2	Carcinomas	Polyps	UC	CD
Age < 40 yr
10 cm	3/4	2/8	36/37	3/5
30 cm	4/4	8/8	37/37	5/5
60 cm	4/4	8/8	37/37	5/5
Entire colon	4/4	8/8	37/37	5/5
Age ≥ 40 yr
10 cm	12/22	10/22	20/20	0/5
30 cm	17/22	13/22	20/20	4/5
60 cm	21/22	21/22	20/20	5/5
Entire colon	22/22	22/22	20/20	5/5

UC: Ulcerative colitis; CD: Crohn’s disease.

¹The length of evaluation was considered 10 cm for anoscopy/rectoscopy, 30 cm for rigid sigmoidoscopy and 60 cm for flexible sigmoidoscopy;

²In patients with multiple lesions of the same type, the nearest lesion to the anal verge has been considered.