A case of small intestinal metastasis of breast cancer diagnosed by intestinal obstruction - Nishinakagawa, Shuta; Inuyama, Mitsuko; Kaneda, Yoko; Ishii, Saki; Orihara, Shinya; Oba, Nobuyuki; Nakajima, Kazuaki; Ogino, Yu; Shiono, Saori; Ikegami, Ryo; Nohara, Shigeo (Progress of Digestive Endoscopy, 2025)