Fig. 3
a Axial unenhanced CT image shows a well-demarcated shallowly-lobulated soft tissue mass in the anterior mediastinum, protruding to the left lung with several nodules around. b Photomicrograph (original magnification, ×200; hematoxylin-eosin stain) shows the oval and fusiform tumor cells, admixed with lymphocytes and neutrophils. c Photomicrograph shows CD-21 immunostaining positive tumor cells