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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Gastroenterology · Chronic Radiation Proctitis

What Do Telangiectasias and Friability Mean on Colonoscopy?

At a Glance

Telangiectasias are fragile widened blood vessels, and friability means the rectal lining breaks or bleeds easily. After pelvic radiation, these findings often support chronic radiation proctitis, but doctors may need biopsies and other evaluation to exclude cancer or other causes.

When you have a colonoscopy after receiving pelvic radiation, your report may mention telangiectasias and friability. These terms describe how the mucosal lining (the inner surface) of your rectum has changed in response to radiation treatment [1].

These findings often support a diagnosis of chronic radiation proctitis—a delayed radiation injury to the rectum [2]. However, these findings do not by themselves rule out recurrent cancer, polyps, or other issues [3][4]. Your clinician must interpret these visual findings alongside your cancer history, symptoms, the rest of the colonoscopy, and any biopsy results to make a definitive diagnosis [1][5].

Understanding Telangiectasias

Telangiectasias (pronounced tuh-lan-jee-ek-TAY-zhuhs) are widened, superficial, spider-like blood vessels on the surface of the rectal lining [6].

When you receive pelvic radiation, the treatment can damage the tiny blood vessels that normally supply oxygen to your healthy tissues, leading to reduced blood flow and ischemia (lack of oxygen) [7][8]. Over time, as part of an abnormal vascular repair process, your body may attempt to grow a new blood supply by releasing chemical signals [9][10]. The resulting vessels, combined with the underlying vascular damage and fibrosis (scarring), appear on a colonoscopy as bright red, spider-web-like clusters [6].

Because this vascular repair process is abnormal, these widened vessels are very delicate and sit close to the surface, making them prone to leaking or breaking.

Understanding Friability

Friability (pronounced fry-uh-BILL-ih-tee) means that the tissue lining your rectum is highly delicate and breaks open or bleeds easily with light contact [2].

Healthy colon and rectal tissue is durable enough to handle the passage of stool. However, radiation compromises the tissue’s ability to repair itself and causes chronic damage [11]. As a result, the protective mucosal lining becomes thin, weak, and highly sensitive. When the tissue is friable, even minor contact—such as normal stool passing through, or the slight friction of the colonoscope during your exam—can irritate the area and cause those fragile telangiectasias to bleed [2].

What This Means For You

Seeing these terms on your report explains why you might be experiencing rectal bleeding. However, you should not assume all bleeding is simply a harmless side effect. The severity of bleeding can range from minor spotting to serious blood loss that leads to anemia (a low red blood cell count) [12].

When to Seek Urgent Care
You should seek emergency medical evaluation if you experience any of the following signs of severe bleeding or significant blood loss:

  • Heavy or continuous rectal bleeding
  • Passing large clots
  • Black or tarry stool [13][14]
  • Dizziness, lightheadedness, or fainting
  • Shortness of breath or chest pain
  • Rapid heartbeat
  • Marked weakness [15][16]

If your bleeding is persistent or bothersome but not an emergency, contact your doctor. They may want to run a complete blood count (CBC) or iron studies to check for anemia [12]. If treatment is needed, there are several options. A common approach is argon plasma coagulation (APC), an endoscopic heat-based treatment used to coagulate superficial bleeding vessels [17]. APC may require several sessions and carries some risks, such as pain, ulceration, or narrowing of the rectum (stricture) [18]. Other options include topical medications or different endoscopic techniques, which your doctor will select based on your specific findings and the severity, or grade, of your injury [19][5].

Common questions in this guide

What are telangiectasias on a colonoscopy report?
Telangiectasias are widened, superficial blood vessels that look like small red spider-web clusters on the rectal lining. After pelvic radiation, they can be a sign of chronic radiation proctitis and may bleed easily because they are fragile.
What does friability mean in the rectum?
Friability means the rectal lining is delicate and can break open or bleed with light contact. Radiation can make the protective tissue thin and less able to repair itself, so stool or the colonoscope may irritate it.
Do telangiectasias and friability prove that I have radiation proctitis?
These findings often support chronic radiation proctitis after pelvic radiation, but they do not prove the diagnosis by themselves. A clinician may also consider your cancer history, symptoms, the rest of the examination, and biopsy results to rule out recurrence, polyps, or other causes.
When should I seek emergency care for rectal bleeding?
Seek emergency medical evaluation for heavy or continuous bleeding, large clots, black or tarry stool, dizziness, fainting, shortness of breath, chest pain, a rapid heartbeat, or marked weakness. These can be signs of serious blood loss.
How is bleeding from chronic radiation proctitis treated?
If bleeding persists, your doctor may order a complete blood count or iron studies to check for anemia. Argon plasma coagulation is a common endoscopic treatment, while topical medicines or other endoscopic methods may also be considered; treatment may require multiple sessions and has risks.
Will I need another colonoscopy after these findings?
The need for a repeat colonoscopy depends on your symptoms, cancer history, biopsy results, and the extent of the findings. Your doctor can explain whether follow-up is needed and what new or worsening symptoms should prompt an earlier evaluation.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Do my colonoscopy findings and biopsy results confirm radiation proctitis, or could something else be causing my bleeding?
  2. 2.Based on the extent of my telangiectasias and my bleeding, should we check a complete blood count (CBC) or iron levels?
  3. 3.Are there treatments like argon plasma coagulation or topical medications that are appropriate for my specific case?
  4. 4.What are the benefits, risks, and expected number of sessions for any recommended endoscopic treatment?
  5. 5.Do I need a repeat colonoscopy in the future, and what specific changes would make that necessary?

Questions For You

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

Related questions

Is One APC Treatment Enough for Radiation Proctitis?What Diet and Fiber Are Best for Radiation Proctitis?When to Start Colon Cancer Screening After Pelvic Radiation?Does Asymptomatic Radiation Proctitis Require Treatment?Is Formalin Treatment Safe for Radiation Proctitis Bleeding?How Many HBOT Sessions Are Needed for Radiation Proctitis?Radiation Proctitis: How to Manage Urgency and Incontinence?Can Prostate Cancer Survivors Take Vitamin E for Proctitis?Are Pencil-Thin Stools After Pelvic Radiation Serious?Hemorrhoids or Radiation Proctitis: Which Causes Bleeding?Radiation Proctitis Bleeding: Sucralfate or Steroid Enemas?When Does Chronic Radiation Proctitis Start After Treatment?Why Is Surgery More Complex for Radiation Proctitis?

References

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This page is for informational purposes only and does not constitute medical advice. Your gastroenterologist or oncology team should interpret your colonoscopy findings and advise you about bleeding and treatment.

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