[Thymic Neuroendocrine Tumor Associated with Multiple Endocrine Neoplasia Type 1]

Multiple endocrine neoplasia (MEN) type 1 is a hereditary syndrome characterized by hyperplasia and adenoma of the parathyroid gland, pancreatic tumor, and pituitary tumor. We report a rare case of thymic neuroendocrine tumor diagnosed after removal of a thymic tumor following pancreatic and parathyroid surgery. A 35-year-old man was diagnosed with MEN type 1 by hypercalcemia and gastrinemia with a ureteral tone. Two well defined nodules in the anterior mediastinum on computed tomography (CT), and a high degree of accumulation on positron emission tomography (PET) was noted. Surgery was performed through a median sternotomy with anterior mediastinal tumor resection. Pathology showed thymic neuroendocrine tumor (NET). Immunostaining results were different from pancreatic NET and duodenal NET, and a diagnosis of primary thymic NET was made. Postoperative radiation therapy was completed as adjuvant therapy, and the patient is alive without reccurrence.