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  • Title: Ectopic thymoma in the paratracheal region of the middle mediastinum: a rare case report and literature review.
    Author: Yajima T, Mogi A, Shimizu K, Kosaka T, Nagashima T, Ohtaki Y, Obayashi K, Nakazawa S, Iijima M, Yoshida Y, Hirato J, Kuwano H.
    Journal: BMC Res Notes; 2018 Apr 25; 11(1):256. PubMed ID: 29695275.
    Abstract:
    BACKGROUND: Thymomas generally arise from the thymus in the anterior mediastinum. Ectopic thymomas arising in the middle mediastinum are rare. We present a case of a thymoma arising from the ectopic thymic tissue in the right paratracheal region. CASE PRESENTATION: The patient was a 67-year-old male who underwent an enhanced-computed tomography examination as preoperative staging for colon cancer. A 20-mm nodule in the right paratracheal region was found incidentally. Fluorodeoxyglucose (FDG) accumulation was detected in this solitary nodule by FDG-positron emission tomography, mimicking an enlarged, possibly malignant lymph node. The tumor was removed by thoracoscopic surgery, and a postoperative pathological diagnosis of type AB thymoma was made. Foci of ectopic thymic tissues were found adjacent to the thymoma. The patient was disease-free and without recurrence 2 years postoperatively. CONCLUSIONS: Including the present case, 13 cases of ectopic paratracheal thymoma have been reported in the English literature, all of which were found on the right side of the paratracheal region. Although ectopic thymomas in the paratracheal region are rare, thymomas may be considered as a differential diagnosis for a paratracheal nodule.
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