Radial Artery Adventitial Cysts Adventitial Cysts of the Radial Artery are Joint Connected Running title : Radial artery adventitial cysts

Corresponding author: Robert J. Spinner, M.D. Mayo Clinic Gonda 8-214 Rochester, MN 55905 Phone (507) 284-2376 FAX (507) 284-5206 Email spinner.robert@mayo.edu ABSTRACT Volar radial wrist masses are common. Adventitial cysts of the radial artery are rarely reported and poorly understood. We describe a case series of adventitial cysts in association with the radial artery and detail their pathophysiology and treatment. We conducted an IRBapproved retrospective review of patients treated at our institution from 1997 to 2018. Twelve patients were identified. Presenting symptoms typically included pain and swelling over the volar radial wrist. High resolution magnetic resonance imaging (MRI) demonstrated tubular, cystic lesions within the adventitia of the radial artery with connections to the wrist joint