Incidental Detection of Mediastinal Thymoma during Tc-99m Tetrofosmin Myocardial Perfusion Imaging

Thymoma is a rare tumor entity. However, it is the most common neoplasm of the anterosuperior mediastinum and the most common primary tumor of the thymus. Seventy percent of thymomas are found in adults in the 5th and 6th decades of life, being rare in children and young adults. There is an approximately equal overall gender ratio. The majority of thymomas are found in the anterior mediastinum. Other locations may be the neck and posterior mediastinum. Most of them range from 5 to 10 cm in size. The authors present an interesting image which was incidentally detected on a Tc-99m Tetrofosmin cardiac perfusion scan and was later proved to be a mediastinal thymoma on histopathology.