Granulomatosis with polyangiitis presenting as multiple renal masses: A case report with MRI findings oleh Takahiro Yamamoto, MD, Yuki Maruchi, MD, PhD, Ayumi Asai, MD, Yumi Takehara, MD, Yu Koshikawa, MD, Shuji Ikeda, MD, PhD, Keishi Kajikawa, MD, PhD, Shogo Banno, MD, PhD, Kojiro Suzuki, MD, PhD