There is no sex predominance. Thymomas arise from thymic epithelium. Most thymomas are slow-growing tumors. This is determined at surgery and is not a histologic diagnosis. Local invasion of the pleura occurs frequently.
Distant metastases are infrequent.
The signal characteristics are not adequate, however, to differentiate benign from malignant thymomas. Calcification is demonstrated in a minority of patients with thymoma. All rights reserved. From Hungaria this is a very big thymoma Malignant thymoma, external appearance, shows a large tumor with variegated appearance typical of this lesion. Ovoid, nodular, well-circumscribed, tan mass.