Thymic Lesion
Overview Thymic tumors occupy the anterior mediastinum, which is immediately posterior to the sternum and the anterior surface of the pericardium and great vessels. Tumors of thymic, lymphatic, or germ cell origin most commonly occur in this compartment, although aberrant parathyroid or thyroid tissue masses are sometimes found, along with vascular and mesenchymal tissue masses. (See the images below.) Fairly large thymus in an infant. View Media Gallery Gross appearance of a thymoma showing distinct multinodularity and scattered, focal cystic changes. View Media Gallery Thymolymphoma. Chest radiograph shows a large, lobulated mediastinal mass. View Media Gallery About one half of all thymic tumors are malignant in individuals aged 20-40 years, and one third are malignant in persons younger than 20 years and those older than 40 years. (A malignant thymic tumor is seen in the image below.) Malignant thymoma. Chest CT scan in a 61-year-old man with myasthenia gr
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