Pancoast tumors are defined primarily by their location at the apex of the lung. Which of the following best describes this definition?

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Pancoast tumors are defined by their location at the apex of the lung and their invasion into structures at the superior thoracic aperture, such as the lower brachial plexus and the sympathetic chain. This apical location is what sets them apart from other lung cancers, which are described by histology (like adenocarcinoma or small cell carcinoma) or by being central near the hilum. The apical position often leads to specific clinical signs, including shoulder and arm pain from brachial plexus invasion and Horner’s syndrome from sympathetic chain involvement. Central tumors, in contrast, arise near the hilum and produce symptoms tied to airway obstruction or airway- and mediastinal involvement, not apex-specific invasion. Therefore, the best description for a tumor defined by apex location is a Pancoast tumor.