A rare case of hemorrhagic cystitis complicated with thrombocytopenia and hemophagocytic syndrome associated with BK virus, under immunosuppressive treatment of systemic lupus erythematosus. Issue 3 (3rd May 2016) - Umeda, Masataka; Ichinose, Kunihiro; Okada, Akitomo; Nishino, Ayako; Aramaki, Toshiyuki; Iwanaga, Nozomi; Terada, Kaoru; Nakamura, Hideki; Ueki, Yukitaka; Kawakami, Atsushi