The safe removal of a superior mediastinal foreign body by mediastinoscopy: a case report by Takashi Sakuma, Tatsuro Tamura, Mikio Nambara, Ken Gyobu, Mami Yoshii, Takahiro Toyokawa, Shigeru Lee, Hiroaki Tanaka, Kazuya Muguruma, Masakazu Yashiro, Masaichi Ohira, Kiyoshi Maeda

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