Step 1: what comes next?
Stabilize
IV access, blood count, type and screen, resuscitation
GI
Gastrointestinal angiodysplasia
A painless bleed can come from a fragile vascular circuit.
- Distinguish angiodysplasia from diverticular and ischemic bleeding
- Connect aortic stenosis, CKD, and von Willebrand dysfunction
- Choose endoscopic and escalation therapy
Perfusion territories
Match vessel, tissue, and consequence
The figure links arterial supply to vulnerable tissue and the expected ischemic findings.
Quick check
A 79-year-old with CKD has recurrent painless maroon stools and iron deficiency. Colonoscopy shows a flat red fernlike lesion in the cecum.
Which diagnosis is most likely?
Reason it through
- Painful or painless?Painless.
- Where is it?Cecum.
- What does fernlike mucosal vasculature indicate?Angiodysplasia.
The right colon is the classic address
Location helps, but the entire gut can harbor lesions.
Cecal and ascending-colon walls have high wall tension and are common sites for degenerative vascular ectasia.
Endoscopy shows a flat or slightly elevated bright-red lesion with fernlike or radiating vessels.
Small-bowel angioectasias should be considered when upper endoscopy and colonoscopy do not explain recurrent iron deficiency or overt bleeding.
Match each lesion to its clinical implication.
Classic colonic distribution
Ectatic fragile channels lie near the luminal surface
Consider capsule or enteroscopy after negative bidirectional endoscopy
High shear can produce acquired von Willebrand dysfunction
A vasa recta source favors diverticular hemorrhage
Stabilize, localize, treat
Hemodynamics come before lesion branding.
Resuscitate significant bleeding, review antithrombotic drugs, and determine whether bleeding is active.
Colonoscopy after appropriate preparation is the main diagnostic and therapeutic test in a stable patient; CTA can localize brisk ongoing bleeding.
Treat culprit lesions endoscopically, commonly with argon plasma coagulation; recurrent refractory bleeding may require medical, angiographic, valve-directed, or surgical strategies.
Order the workflow.
Step 2: what comes next?
Localize
Colonoscopy when stable; CTA for brisk active hemorrhage
Step 3: what comes next?
Recognize
Flat or slightly raised red ectatic vessels with radiating branches
Step 4: what comes next?
Ablate
Endoscopic thermal therapy such as argon plasma coagulation
Step 5: what comes next?
Reassess recurrence
Look for multiple lesions, CKD, acquired von Willebrand dysfunction, or severe aortic stenosis
Escalate by bleeding burden
The lesion matters less than what it is doing to the patient.
Occult iron deficiency is lower acuity but still requires evaluation for alternative lesions.
Recurrent overt bleeding, transfusion dependence, hemodynamic instability, and failure of endoscopic therapy progressively raise urgency.
A single normal colonoscopy does not end the workup when bleeding is intermittent and small-bowel disease remains plausible.
Place the presentations by urgency.
Incidental lesion without anemia
Occult iron deficiency
Recurrent self-limited hematochezia
Transfusion-dependent recurrence
Active hemorrhage with shock
Painless does not mean featureless
Bleeding pattern and substrate narrow the source.
Angiodysplasias are thin-walled ectatic mucosal and submucosal vessels, commonly in the cecum and ascending colon of older adults.
Bleeding is painless, intermittent, and can be occult or overt; lesions may be multiple.
Diverticular hemorrhage is also painless and brisk, but arises from an injured vasa recta at a diverticulum rather than a flat vascular tuft.
Separate common painless lower-GI sources.
Older adult, recurrent or occult bleeding, right-colon vascular ectasias
Often abrupt, larger-volume painless hematochezia from a diverticulum
Crampy pain precedes hematochezia
Chronic occult loss, altered bowel habits, or focal mass
The association triad
A valve can create a bleeding disorder downstream.
Severe aortic stenosis can produce high shear, loss of high-molecular-weight von Willebrand multimers, and bleeding from angiodysplasias: Heyde syndrome.
CKD is associated with angiodysplasia and adds platelet dysfunction and recurrent bleeding risk.
Association does not prove that every incidental lesion caused the hemorrhage; correlate with active bleeding and exclude other sources.
Select the accurate statement.
Therapy is layered, not one-and-done
Treat the culprit and the recurrence driver.
Endoscopic argon plasma coagulation is a common first-line therapy for accessible bleeding lesions.
Active bleeding not controlled or reached endoscopically can be localized and embolized angiographically; surgery is reserved for selected localized refractory disease.
For recurrent transfusion-dependent bleeding from diffuse lesions, somatostatin analog therapy has evidence; severe aortic stenosis with Heyde syndrome warrants valve-team assessment because valve replacement can reduce bleeding.
Reveal the clinical implication of each finding.
Endoscopic ablation, commonly argon plasma coagulationCTA localization followed by angiographic embolization when appropriateConsider a long-acting somatostatin analog with specialist guidanceAddress the valve as well as the GI lesionNo automatic treatment solely because it is seen
Stage 1 of 3: Overview
Overview
Gastrointestinal angiodysplasia
Hemodynamics come before lesion branding.
Flow check
Localize the threatened territory
Choose the perfusion clue that localizes the injured tissue.
Which diagnosis is most likely?
- Key finding. A 79-year-old with CKD has recurrent painless maroon stools and iron deficiency. Colonoscopy shows a flat red fernlike lesion in the cecum.
- Answer. Colonic angiodysplasia
- Why. The age, right-colon location, recurrent painless bleeding, and ectatic appearance are characteristic.
- Board rule. Right colon plus a vascular tuft is angiodysplasia.
Localize the vascular lesion
The challenge is proving that a vascular ectasia is the culprit rather than an incidental passenger.
Cross out the wrong vascular territory and highlight the threatened tissue. Each case links vessel, bed, and consequence.
A 76-year-old with severe calcific aortic stenosis has recurrent painless hematochezia. Colonoscopy shows clusters of dilated tortuous vessels in the ascending colon.
What diagnosis unifies the bleeding pattern and colonoscopic finding?
Reason it through
- Is the bleeding inflammatory or vascular?Painless intermittent bleeding favors a vascular lesion.
- Where are these lesions commonly found?Angiodysplasia often involves the cecum or ascending colon.
- What association strengthens the pattern?Aortic stenosis is linked to gastrointestinal angiodysplasia and acquired von Willebrand dysfunction.
severe calcific aortic stenosisdilated tortuous vessels in the ascending colon
- Is the bleeding inflammatory or vascular?Painless intermittent bleeding favors a vascular lesion.
- Where are these lesions commonly found?Angiodysplasia often involves the cecum or ascending colon.
- What association strengthens the pattern?Aortic stenosis is linked to gastrointestinal angiodysplasia and acquired von Willebrand dysfunction.
An older adult has recurrent GI bleeding, severe calcific aortic stenosis, and reduced high-molecular-weight von Willebrand multimers.
What syndrome is present?
Reason it through
- What does the stenotic valve create?High shear.
- What protein pattern is lost?Large von Willebrand multimers.
- Where does bleeding occur?Fragile GI angiodysplasias.
What does the stenotic valve create?What protein pattern is lost?
- What does the stenotic valve create?High shear.
- What protein pattern is lost?Large von Willebrand multimers.
- Where does bleeding occur?Fragile GI angiodysplasias.
A stable patient has a cecal angiodysplasia actively oozing during colonoscopy.
What is the best initial hemostatic approach?
Reason it through
- Is the lesion reached?Yes.
- Is the patient stable?Yes.
- Can local endoscopic energy seal it?Yes, argon plasma coagulation is commonly used.
Is the lesion reached?Is the patient stable?
- Is the lesion reached?Yes.
- Is the patient stable?Yes.
- Can local endoscopic energy seal it?Yes, argon plasma coagulation is commonly used.
A patient develops sudden large-volume painless hematochezia. Colonoscopy identifies an exposed vessel at a sigmoid diverticulum and no vascular tufts.
What source is most likely?
Reason it through
- Was there pain?No.
- What anatomic structure carries the stigma?A diverticulum.
- Is a vascular tuft present?No.
Was there pain?What anatomic structure carries the stigma?
- Was there pain?No.
- What anatomic structure carries the stigma?A diverticulum.
- Is a vascular tuft present?No.
A patient with diffuse small-bowel angioectasias remains transfusion dependent despite repeated endoscopic therapy.
Which next strategy is reasonable?
Reason it through
- Is there one resectable lesion?No, disease is diffuse.
- Has endoscopic therapy controlled it?No.
- What medical layer can reduce recurrent bleeding?A long-acting somatostatin analog.
Is there one resectable lesion?Has endoscopic therapy controlled it?
- Is there one resectable lesion?No, disease is diffuse.
- Has endoscopic therapy controlled it?No.
- What medical layer can reduce recurrent bleeding?A long-acting somatostatin analog.
Rapid review
Three questions to check
Which diagnosis is most likely?
Colonic angiodysplasia. The age, right-colon location, recurrent painless bleeding, and ectatic appearance are characteristic.
Is the bleeding inflammatory or vascular?
Painless intermittent bleeding favors a vascular lesion.
Where are these lesions commonly found?
Angiodysplasia often involves the cecum or ascending colon.
Medically reviewed
Fatima Ali, DO
PGY-1 Resident Physician in Psychiatry
University Hospitals, Columbia
DO from Kansas City University
Resident physician and founding medical reviewer at Bone Wizardry, focused on clinical accuracy, clear diagnostic reasoning, and practical board-oriented teaching across the curriculum.
Languages: English, Urdu
Primary reviewerFull physician profile
Medically reviewed
Sources
- Angiodysplasia2023
- Heyde Syndrome2023
- Angiodysplasia in Renal Disease Patients: Analysis of Risk Factors and Approach to Manage Such Patients2020
Bone Wizardry is a study resource for medical students. It is not medical advice.