Yajima T, Mogi A, Shimizu K, Kosaka T, Nagashima T, Ohtaki Y, Obayashi K, Nakazawa S, Iijima M, Yoshida Y, Hirato J, Kuwano H. Ectopic thymoma in the paratracheal region of the middle mediastinum: a rare case report and literature review. BMC Res Notes, 11(1):256, 2018.