What is pancoast syndrome?

Superior sulcus. This is a syndrome that results from a tumor that sits in the top or apex of the lung, called a superior sulcus tumor. These tumors if appropriate stage should be removed surgically. The symptoms should resolve, except for the facial smptoms (horner's syndrome).
Pain, small pupil. Pain in the arm and shoulder, a small pupil, and loss of sweating on the face, all on the same side. This is caused by a lung cancer in the upper part of the lung which compresses nerves at the base of the neck.