A 55-year-old man was admitted for transcatheter closure because of pulmonary arteriovenous fistula by magnetic resonance angiography（MRA）.He had a history of occasional chest pain more than one year.Angiography didn’t reveal significant stenosis at coronary artery.The patient was found a continuous grade 2/6 murmur over the left upper parastenal area one month ago.Chest MRA revealed a possible left superior pulmonary arteriovenous fistula.For diagnosis and localization of the fistula

aortography and selective angiography of the internal mammary artery was performed and presented a left internal mammary artery-to-pulmonary artery fistula.The fistula was successfully closed using an 12 mm domestic vascular plug.Chest MRA showed that the fistula disappeared at two-month follow-up.