<prompt> M. C. anterior mediastinum tumor isThymomaNeurogenic FibromaLymphomaMeningocele  <response>: Ans is a ie Thymoma 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 