ModulePublishedclinician-educationstroke-escalationimaging

Brain AVMs — hemorrhage risk, imaging (CTA/MRA/DSA), and what ‘nidus’ means (Advanced)

Advanced course: arteriovenous malformations (AVMs) are abnormal artery-to-vein connections that can bleed. Learn key terms (nidus), how CT/MRI detect hemorrhage and associated injury, and how CTA/MRA and catheter angiography map vessels.

ClinicianCaregiver, SurvivorAdvanced24 minGrade 11

Educational only

Educational only — not medical advice.

Get help now

If a patient develops new or worsening stroke symptoms, reduced consciousness, seizure, severe headache, airway/swallowing danger, or unstable vital signs, activate emergency response and follow local stroke escalation protocols.

Key takeaways

  • Explain AVM as abnormal artery-to-vein connection
  • Recognize hemorrhage presentations that require emergency care
  • Explain CTA/MRA vs DSA roles for vessel mapping
  • Ask questions about follow-up imaging and prevention of re-bleed

Why this matters

Content outline is being prepared for review.

Clinical frame

Content outline is being prepared for review.

Core clinical idea

Content outline is being prepared for review.

Assessment and workup

Content outline is being prepared for review.

Clinical reasoning pathway

Content outline is being prepared for review.

Management and team actions

Content outline is being prepared for review.

Common pitfalls

Content outline is being prepared for review.

Patient-safe explanation

Content outline is being prepared for review.

Escalation and safety signals

Content outline is being prepared for review.

Applied case

Content outline is being prepared for review.

Clinical scenario

Content outline is being prepared for review.

Common misconceptions

Content outline is being prepared for review.

Reflect

Content outline is being prepared for review.

Key takeaways

  • Understand AVM as abnormal artery-to-vein connection
  • Advanced stroke care requires reconciling the clinical syndrome with timing, imaging, medication risk, patient context, and local pathway capacity.
  • A safe plan names escalation thresholds, responsible clinicians, patient-facing instructions, and the next step if results or symptoms change.

Practice check

What you’ll practice

These questions are untimed. After you answer all of them, you’ll see your score and a clear next lesson or reference step.

0 of 4 answered

Question 1

1. A learner is applying this lesson on Brain AVMs — hemorrhage risk, imaging (CTA/MRA/DSA), and what ‘nidus’ means. Which approach best reflects advanced clinical reasoning?

Question 2

2. Which actions show safe handling of Brain AVMs — hemorrhage risk, imaging (CTA/MRA/DSA), and what ‘nidus’ means? Select all that apply.

Question 3

3. Place the safe clinical sequence for Brain AVMs — hemorrhage risk, imaging (CTA/MRA/DSA), and what ‘nidus’ means in order.

Question 4

4. For Brain AVMs — hemorrhage risk, imaging (CTA/MRA/DSA), and what ‘nidus’ means, a normal or non-specific early test result is enough to stop reassessment when the clinical syndrome still suggests risk.

References

  1. Tier 1American Heart Association/American Stroke Association2022
    2022 Guideline for the Management of Patients With Spontaneous Intracerebral Hemorrhage
  2. Tier 2RadiologyInfo.org2025
    CT Angiography of the Head
  3. Tier 2RadiologyInfo.org2025
    Magnetic Resonance Imaging (MRI) - Head
  4. Tier 2RadiologyInfo.org2025
    Cerebral Angiography