<prompt> Answer this question truthfullyCan you explain what an arteriovenous fistula is?  <response>: <reason> In the case of a coronary arteriovenous fistula AVF, patients can be asymptomatic or can present with:Continuous murmur Cardiomegaly Chest pain Fatigue Palpitation Angina Bacterial endocarditisSystemic hypotension Fistulae involving the spinal vasculature can present with neurologic symptoms of the lower extremities which may include weakness and sensory disturbance. Acquired arteriovenous fistula AVF can result in digital clubbing. Patients on hemodialysis with arteriovenous fistula AVF can develop pseudo- Kaposis sarcoma. Abdominal arteriovenous fistulae can present with:Lower extremity edema with cyanosis Pulsatile varicose veins Scrotal edema Ilio - iliac arteriovenous fistula AVF presents with progressive abdominal distention, dyspnea, and edema of the leg, which makes it difficult to distinguish from deep venous thrombosis DVT and can lead to a delay in the diagnosis. Tentorial dural arteriovenous fistula AVF can rarely manifest as trigeminal neuralgia. 