The patient was a 68-year-old man who had an extended thymectomy for invasive thymoma associated with myasthenia gravis at the age of 51. Seventeen years later he was found to have multiple distant metastases located in the right thoracic wall, the mediastinal lymph nodes, bone tissue, lung tissue, adrenal tissue, and bilateral glutei. Despite radiation therapy to the sacrum and systemic chemotherapy, the patient died not having had a response to therapy. Based on the autopsy findings, multiple metastases combined with thymoma (Type B2, B3) and thymic carcinoma were diagnosed. We report this rare case and present the pathology of the primary, as well as each metastatic region.