Yawnick underwent a CAT scan that confirmed the presence of three tumors around his heart. Subsequent biopsies and a PET scan led to a diagnosis of primary mediastinal B-cell non-Hodgkin lymphoma.

A subsequent CAT scan showed three tumors cushioning Yawnick's ... and a PET scan before learning he had primary mediastinal ...

2). Our differential diagnoses were either a thymic lymphoma or a thymoma. We then submitted formalin-fixed tissue of the mediastinal mass to the University of Missouri Research Animal Diagnostic ...