<prompt> In a case of myasthenia gravis, CT Chest shows anterior mediastinal mass. Diagnosis is?Retrosternal goiterThymic HyperplasiaHilar LymphadenopathyAoic Aneurysm  <response>: Thymus gland abnormalities are seen in 75 of anti-Ach Receptor positive antibodies patients. CT chest can identify a Thymic hyperplasia or a thymoma which though benign can produce mass effects. 