<prompt> M. C. anterior mediastinum tumor is -ThymomaNeurogenic FibromaLymphomaMeningocele  <response>: RememberMost common mediastinal mass Neurogenic tumorsMost common Ant. mediastinal mass ThymomaMost common Middle mediastinal mass Bronchogenic pleuropericardial cystsMost common Posterior mediastinal mass Neurogenic tumorMost common malignant mass of mediastinum LymphomasMost common mediastinal mass in children Neurogenic tumor 