thymoma
(thy-MOH-muh)
A tumor of the thymus, an organ that is part of the lymphatic system and is located in the chest, behind the breastbone.
The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.
Updates regarding government operating status and resumption of normal operations can be found at opm.gov.