Foreign-body granulomas and abscesses caused by dropped gallstones after cholecystectomy: Four cases diagnosed with multimodality imaging oleh Shigetaka Sato, MD, Akitoshi Inoue, MD, PhD, Shinichi Ota, MD, PhD, Akira Furukawa, MD, PhD, Yoshihiro Miyagawa, MD, Makoto Wakamiya, MD, PhD, Tomohiro Hirose, MD, PhD, Kenji Furuichi, MD, PhD, Yoshiyuki Watanabe, MD, PhD