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Vol.60 No.7 contents | Japanese/English |
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- Case Report -
A Resected Case of Carcinoid Tumor Originating from the Middle Mediastinum
Takashi Karashima1, Daiki Noda1, Miyuki Abe1, Kentaro Anami1, Michiyo Miyawaki1, Hideya Takeuchi1, Tatsuro Okamoto1, Tsutomu Daa2, Kenji Sugio11Department of Thoracic and Breast Surgery, 2Department of Diagnostic Pathology, Oita University Faculty of Medicine, Japan
Background. Carcinoid tumors are neuroendocrine tumors; however, carcinoid tumors originating in the middle mediastinum are rare. Case. The patient was a 60-year-old man with an abnormal shadow on a chest X-ray that was identified in a medical check-up. CT showed a tumor on the ventral side of the trachea. Contrast-enhanced CT and MRI showed a solid part with a heterogeneous contrast effect; however, PET-CT showed low accumulation of FDG. Six months later, CT showed that the tumor increased in size from 20 mm to 24 mm. The operative findings showed that the tumor was located from the lower part of the thyroid to the middle mediastinum, without invasion of the surrounding tissue. No lymphadenopathy was found. Histopathologically, the tumor cells were uniform and polygonal, which were relatively small in size, with round nuclei. Neither necrosis nor mitosis was found. Based on these findings, the tumor was diagnosed as a typical carcinoid tumor. The patient did not receive postoperative adjuvant chemotherapy, and a disease-free status was achieved. Conclusion. The prognosis of carcinoid tumor varies depending on the histological grade. Surgical resection is required for tumors originating in the middle mediastinum because of the difficulty in making a histological diagnosis.
key words: Carcinoid tumor, Typical carcinoid tumor, Middle mediastinum
Received: May 5, 2020
Accepted: September 7, 2020
JJLC 60 (7): 1012-1016, 2020
