stage IV thymoma

Definition of stage IV thymoma
National Cancer Institute

stage IV thymoma

(... thy-MOH-muh)
Stage IV is divided into stages IVA and IVB, depending on where the cancer has spread. In stage IVA, cancer has spread widely around the lungs and heart. In stage IVB, cancer has spread to the blood or lymph system.

Source: NCI Dictionary of Cancer Terms