How is thymus cancer diagnosed?

Imaging and biopsy: Imaging is usually the first step in diagnosing thymus pathology. Ct scan would probably be required to differentiate between potentially malignant and benign lesions. Finally, biopsy will need to be performed to determine the cancer type and stage.

Biopsy: From the wording i infer that thymus is already targeted by imaging. Biopsy should be the next step.