Skip to content
How It Works
Explore
Resources Ask a Question
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 15 peer-reviewed journal articles Updated
Gastroenterology

Pathology & Grading Systems for Radiation Proctitis

At a Glance

The CTCAE grading system helps doctors measure the severity of radiation proctitis, ranging from Grade 1 (mild) to Grade 4 (severe). Endoscopy and pathology reports guide treatment by detailing specific radiation damage, such as fragile blood vessels (telangiectasias) and scar tissue.

When you undergo an endoscopy or have a biopsy after pelvic radiation, your doctors use specific medical terminology and grading systems to measure the extent of the damage. Understanding these reports can help you participate more effectively in your care [1][2].

Common Endoscopic Findings

During a rectoscopy or colonoscopy, the doctor looks for specific visual changes in the rectal lining (mucosa) that are characteristic of radiation injury [3]. Note that if these findings are “asymptomatic” (causing no issues for you), they generally do not require treatment. Attempting to treat asymptomatic lesions can sometimes cause unnecessary harm [3].

  • Telangiectasia: Small, widened, spider-like blood vessels near the surface of the rectal lining. They are fragile and are the primary cause of bleeding [4][5].
  • Friability: Tissue that bleeds easily when touched by the endoscope, indicating fragile vessels [1][6].
  • Mucosal Pallor: The rectal lining may appear pale due to reduced blood flow and scar tissue (fibrosis) [1].
  • Ulceration: Sores or breaks in the rectal lining. Deep ulcers can sometimes lead to complications like fistulas [7][8].
  • Stricture: A narrowing of the rectum caused by thick scar tissue [8][9].

Grading the Severity

Doctors use standardized scales to “grade” your condition. These grades determine whether you need simple medical management or more intensive procedures. The Common Terminology Criteria for Adverse Events (CTCAE) is the most widely used system to grade how symptoms affect your life [10][11].

Grade Description Management
Grade 1 Mild symptoms; occasional bleeding or slight change in bowel habits. Observation; no medical intervention needed [10].
Grade 2 Moderate symptoms; more frequent bleeding, urgency, or discharge. Requires medical management (e.g., enemas or medications) [10].
Grade 3 Severe symptoms; significant bleeding or incontinence. Requires hospitalization or urgent medical intervention (e.g., APC) [10][12].
Grade 4 Life-threatening; perforation or major hemorrhage. Urgent surgery or intensive care required [10].

Reading Your Pathology Report

If a biopsy (a small tissue sample) is taken, the pathologist will look for microscopic signs of radiation damage:

  • Crypt Distortion: The small glands in the rectal lining may appear shortened or damaged [13][14].
  • Stromal Fibrosis: The buildup of thick scar tissue in the deeper layers of the rectal wall [14][15].
  • Vascular Changes: Thickened and hardened vessel walls (hyalinization), confirming radiation damage [4][5].

Checklist for Your Reports

A complete endoscopy report for radiation proctitis should ideally document:

  • [ ] The presence and density of telangiectasias [1].
  • [ ] Whether the damage is circumferential (all the way around) or localized [3].
  • [ ] The proximal extent (how far up into the bowel the damage goes) [1].
  • [ ] The presence of any ulcers or strictures [1].
  • [ ] A formal grade, such as a CTCAE grade [1][3].

Common questions in this guide

What is a CTCAE grade for radiation proctitis?
The CTCAE is a standardized grading system doctors use to measure the severity of your symptoms. Grades range from 1 (mild symptoms needing observation) to 4 (life-threatening issues requiring urgent care or surgery).
What does telangiectasia mean on my endoscopy report?
Telangiectasias are small, fragile, spider-like blood vessels on the surface of your rectal lining. They are a classic sign of radiation damage and are the primary cause of rectal bleeding.
Why does my doctor's report mention rectal friability?
Friability means the tissue of your rectal lining bleeds easily when touched by the endoscope. This indicates that the blood vessels are highly fragile due to radiation exposure.
What does stromal fibrosis mean on a biopsy?
Stromal fibrosis refers to the buildup of thick scar tissue in the deeper layers of the rectal wall. Pathologists look for this microscopic sign to confirm chronic radiation damage after a biopsy.
Do asymptomatic radiation lesions need to be treated?
Generally, visual changes in the rectum that do not cause any bleeding or pain do not require treatment. In fact, attempting to treat asymptomatic areas can sometimes cause unnecessary harm.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is my CTCAE grade, and how does it affect my treatment plan?
  2. 2.The report mentions 'friability'—does this mean I am at a higher risk for significant bleeding?
  3. 3.Did the endoscopy show any evidence of ischemia or a stricture that I should be concerned about?
  4. 4.Was the radiation damage circumferential (all the way around the rectum) or localized to one area?
  5. 5.If a biopsy was taken, how did you distinguish between radiation-induced changes and other conditions?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (15)
  1. 1

    [Chinese expert consensus on multidisciplinary diagnosis and treatment of radiation rectal injury (2021 edition)].

    , ,

    Zhonghua wei chang wai ke za zhi = Chinese journal of gastrointestinal surgery 2021; (24(11)):937-949 doi:10.3760/cma.j.cn441530-20210927-00387.

    PMID: 34823293
  2. 2

    Radiation Proctitis: A Review of Pathophysiology and Treatment Strategies.

    Bhatia M, Suliman H, Ahmed R, et al.

    Cureus 2024; (16(9)):e70581 doi:10.7759/cureus.70581.

    PMID: 39483948
  3. 3

    [Chinese consensus on diagnosis and treatment of radiation proctitis (2018)].

    Wang L, Wang J

    Zhonghua wei chang wai ke za zhi = Chinese journal of gastrointestinal surgery 2018; (21(12)):1321-1336.

    PMID: 30588581
  4. 4

    ASGE guideline on the role of endoscopy for bleeding from chronic radiation proctopathy.

    Lee JK, Agrawal D, Thosani N, et al.

    Gastrointestinal endoscopy 2019; (90(2)):171-182.e1 doi:10.1016/j.gie.2019.04.234.

    PMID: 31235260
  5. 5

    Emerging role of thalidomide in the treatment of gastrointestinal bleeding.

    McFarlane M, O'Flynn L, Ventre R, Disney BR

    Frontline gastroenterology 2018; (9(2)):98-104 doi:10.1136/flgastro-2017-100870.

    PMID: 29588836
  6. 6

    Complication and remission rates after endoscopic argon plasma coagulation in the treatment of haemorrhagic radiation proctitis.

    Siow SL, Mahendran HA, Seo CJ

    International journal of colorectal disease 2017; (32(1)):131-134 doi:10.1007/s00384-016-2635-1.

    PMID: 27527929
  7. 7

    The role of endoscopic evaluation for radiation proctitis in patients receiving intermediate-dose postoperative radiotherapy for rectal cancer.

    Lee J, Han HJ, Min BS, et al.

    Japanese journal of clinical oncology 2018; (48(11)):988-994 doi:10.1093/jjco/hyy126.

    PMID: 30239826
  8. 8

    Radiation-induced recto-urinary fistula: A dreaded complication with devastating consequences.

    Yu KR, Keller-Biehl L, Smith-Harrison L, et al.

    Surgery in practice and science 2023; (15()):100216 doi:10.1016/j.sipas.2023.100216.

    PMID: 39844801
  9. 9

    Interventions for Radiation-Induced Fibrosis in Patients With Breast Cancer: Systematic Review and Meta-analyses.

    Nogueira RMP, Vital FMR, Bernabé DG, Carvalho MB

    Advances in radiation oncology 2022; (7(3)):100912 doi:10.1016/j.adro.2022.100912.

    PMID: 35647406
  10. 10

    Magnetic Resonance Imaging-Directed Stereotactic Body Radiation Therapy Microboost in Concert With Pelvic Nodal Irradiation for Prostate Cancer in the Higher-Risk Spectrum: Toxicity.

    Musthafa M, Wells M, Kearney T, et al.

    Advances in radiation oncology 2026; (11(4)):101997 doi:10.1016/j.adro.2026.101997.

    PMID: 41809561
  11. 11

    To evaluate the use of tandem and cylinder as an intracavitary brachytherapy device for carcinoma of the cervix with regard to local control and toxicities.

    Gadda IR, Khan NA, Wani SQ, Baba MH

    Journal of cancer research and therapeutics 2022; (18(3)):740-746 doi:10.4103/jcrt.jcrt_243_21.

    PMID: 35900548
  12. 12

    Patient- and physician-reported radiation-induced toxicity of short-course radiotherapy with a prolonged interval to surgery for rectal cancer.

    Verweij ME, Hoendervangers S, von Hebel CM, et al.

    Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland 2023; (25(1)):24-30 doi:10.1111/codi.16315.

    PMID: 36054676
  13. 13

    [Progressive radiation-induced rectal injury: is there an opportunity to get out of a vicious circle? A clinical case].

    Skvortsova TE, Oganezova IA, Medvedeva OI

    Terapevticheskii arkhiv 2023; (95(10)):870-875 doi:10.26442/00403660.2023.10.202453.

    PMID: 38159020
  14. 14

    Radiation-Induced Brachial Plexopathy: Current Understanding, Diagnosis, and Treatment Options.

    Lambi AG, Holy T, Tomlinson RE, Barbe MF

    Journal of hand surgery global online 2026; (8(1)):100896 doi:10.1016/j.jhsg.2025.100896.

    PMID: 41446316
  15. 15

    Effects of Mesenchymal Stem Cells Treatment on Radiation-Induced Proctitis in Rats.

    Kim WH, Yoo JH, Yoo IK, et al.

    Yonsei medical journal 2023; (64(3)):167-174 doi:10.3349/ymj.2022.0342.

    PMID: 36825342

This guide explains radiation proctitis pathology and grading terminology for educational purposes. Your gastroenterologist or oncologist is the best source for interpreting your specific reports.

Get notified when new evidence is published on Radiation proctitis.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.