The Synchronous Primary Carcinomas of the Rectum and Thymus

Thymomas are rare neoplasm arising in thymic epithelial cells and are the most common neoplasm in the anterior mediastinum. Although thymomas are often associated with autoimmune diseases, the incidence of extra-thymic neoplasia is higher in patients with thymoma than in the general population.1 Published series have focused on the incidence of both extra-thymic malignancies detected after and before the diagnosis of thymoma. In this case report we are presenting a patient operated due to synchronous rectal cancer and malign thymoma diagnosis. To the best of our knowledge, this is the first case presented with synchronous rectal cancer and malign thymoma.