Pancoast tumor

Definition of Pancoast tumor
National Cancer Institute

Pancoast tumor

(PAN-koste TOO-mer)
A type of lung cancer that begins in the upper part of a lung and spreads to nearby tissues such as the ribs and vertebrae. Most Pancoast tumors are non-small cell cancers. Also called pulmonary sulcus tumor.

Source: NCI Dictionary of Cancer Terms