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A 58-year-old woman presents to an otolaryngology clinic for recurrent bleeding from her left nostril over the past 6 weeks. Episodes last approximately 10 minutes and resolve with direct pressure. Two weeks ago, an apparent bleeding site on the anterior nasal septum was treated with silver nitrate, but the episodes have continued. She takes no anticoagulants and reports no easy bruising, gingival bleeding, or family history of abnormal bleeding. Her vital signs are normal. Anterior rhinoscopy shows a healed cauterization site without an identifiable bleeding source. Her platelet count, prothrombin time, and activated partial thromboplastin time are normal. Which of the following is the most appropriate next diagnostic study to identify the source of her bleeding?
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