Gastric inflammatory myofibroblastic tumor presented with severe anemia and inflammation: a case report oleh Sakura Hiramatsu, Ryo Ataka, Yusuke Nakayama, Miho Hirai, Ayako Hirata, Jun Takeshima, Kenjiro Hirai, Shinya Hamasu, Ikuo Aoyama, Tetsuro Hirose