Asymptomatic sigmoid diverticulum perforation-induced subcutaneous, mediastinal, and retroperitoneal emphysema: A case report and literature review by Daichi Setoguchi, Naoki Iwanaga, Kotaro Nema, Tomoya Hagiwara, Kotaro Hayashida, Koki Yamashita, Tatsuro Hirayama, Masataka Yoshida, Kazuaki Takeda, Shotaro Ide, Masato Tashiro, Takahiro Takazono, Masachika Kitajima, Noriho Sakamoto, Koichi Izumikawa, Katsunori Yanagihara, Keiji Inoue, Hiroshi Mukae

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