Comparison of Imaging Findings between Granulomatosis with Polyangiitis and Eosinophilic Granulomatosis with Polyangiitis on Sinus CT: Importance of High-Density Opacification of the Paranasal Sinuses

^aFrom the Department of Radiology (I.R., S.P., A.K., O.S.), Boston Medical Center, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts
^bDepartment of Radiology (I.R., K.B., O.S.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
^cDepartment of Radiology (I.R.), Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea
^dDepartment of Radiology (O.S.), Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts

Please address correspondence to Osamu Sakai, MD, PhD, FACR, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 55 Fruit St, Boston, MA 02114; e-mail: osakai{at}mgb.org