Pancoast tumor is a mass at the apex of the lung typically associated with which description?

• A. Malignant tumor at the apex of the lung invading adjacent structures
• B. Benign apical lung mass
• C. Esophageal diverticulum
• D. Pleural effusion due to infection

Answer: (B)

A Pancoast tumor is a malignant neoplasm located at the apex of the lung that extends into nearby structures, such as the brachial plexus, subclavian vessels, first ribs, or vertebral bodies. This invading, invasive behavior into adjacent tissues is what defines the description and sets it apart from other apical masses or thoracic issues. A benign apical mass wouldn’t show this aggressive invasion pattern. An esophageal diverticulum is a different esophageal abnormality, and a pleural effusion from infection presents as fluid accumulation rather than a discrete apical mass. So the key idea is a malignant apical lung tumor that invades neighboring structures.