Abstract
The thymus is encountered on all cross-sectional imaging studies of the chest, unless ectopic or surgically absent. Thymus has a variable appearance, undergoes dynamic changes during periods of stress and ages, and demonstrates numerous different lesions. Understanding the radiologic features of normal variants and benign conditions can help prevent unnecessary imaging and intervention. In this article, normal thymic anatomy and its development, remnant thymic tissue and thymic hyperplasia will be reviewed. In addition, radiological images that will distinguish it from other malign pathologies of the thymus will be reviewed.