You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is not seen in Anterior mediastinum and explain in detail?
* The anterior mediastinum is the poion of the mediastinum anterior to the pericardium and below the thoracic plane. * It forms the anterior pa of the inferior mediastinum * contains the thymus, lymph nodes, and may contain the poions of a retrosternal thyroid. Mediastinal Tumors and Other Masses Superior Mediastinum .- LymphomaThymoma Thyroid lesions Metastatic carcinoma Parathyroid tumors Anterior Mediastinum -= Thymoma Teratoma Thyroid lesions Parathyroid tumors Posterior Mediastinum-= Neurogenic tumors Neurogenic tumors -= Bronchogenic cyst Pericardial cyst Lymphoma REF : HARRISONS 21ST ED