Lobularity in Autoimmune Pancreatitis Was A Steroid-Therapy Responding Endoscopic Ultrasound Finding

Lobularity in AIP was the most responsive EUS finding to the steroid therapy. Focal lobularity was corresponded to storiform fibrosis between lobular structures infiltrated by IgG4-positive plasma cells. Thus, our findings might help elucidate the pathogenesis of AIP that is responsive to steroid therapy.