RT Journal Article SR Electronic T1 Exertional hypoxia in a healthy adult: a pulmonary arteriovenous malformation JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e231981 DO 10.1136/bcr-2019-231981 VO 12 IS 10 A1 Kyle Keinath A1 Megan Vaughn A1 Nathan Cole A1 Shari Gentry YR 2019 UL http://casereports.bmj.com/content/12/10/e231981.abstract AB Pulmonary arteriovenous malformations (PAVMs) are a rare cause of pulmonary symptoms, including dyspnoea on exertion, hypoxemia and haemoptysis. PAVMs are an aetiology that is often overlooked by physicians when developing a differential diagnosis for pulmonary symptoms and unidentified lung masses. However, it is an important differential diagnosis to have as PAVMs can have serious sequelae including strokes, brain abscess and life-threatening bleeding. We present a case of an impressive PAVM presenting with chest pain, chronic cough, feelings of anxiety, mild resting hypoxemia and exertional hypoxemia. Of note, on previous chest X-ray, 8 years prior to presentation, an incidental mass was found during a shoulder repair presurgical workup but not further evaluated.