1. CT A 63-year-old man with a anterior mediastinal mass

2. VATS excision Cystic thymoma, WHO type A Cyst WHO type A thymoma

3. Low power view Cystic thymoma, WHO type A

4. Medium power view Cystic thymoma, WHO type A

5. High power view Cystic thymoma, WHO type A Spindle and oval shaped tumor cell form cysts of various size