Objectives/hypothesis: Arteriovenous malformations involving the external ear are relatively uncommon in adults. Arteriovenous malformations in the head and neck can poses difficult therapeutic challenges.
Study design: Case report.
Methods: We report a case of a large arteriovenous malformation in the external ear in a 41-year-old man.
Results: Extensive enlargement of the previously latent and asymptomatic arteriovenous malformation was triggered by blunt trauma to the ear.
Conclusion: We discuss the definition, clinical findings, diagnostic approaches, and therapeutic management of arteriovenous malformations.