Pancoast tumor

A pancoast tumor, also pancoast tumour (UK) or superior sulcus tumor, is a tumor of the pulmonary apex i.e. a type of lung cancer defined primarily by its location situated at the top end of either the right or left lung. The growing tumor can cause compression of a brachiocephalic vein, subclavian artery, phrenic nerve, recurrent laryngeal nerve, or, characteristically, compression of a sympathetic ganglion resulting in a range of symptoms known as Horner's syndrome.
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Pancoast tumor Pulmonary sulcus tumor Oncology A non-small cell lung CA arising in the upper lung, which extends to adjacent tissues–eg, ribs, [more]Pancoast tumor - Community and Resources

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.