A 67-year-old man presents with persistent cough. Chest X-ray shows a large left-sided thoracic mass, and chest CT confirms a 17 cm pleural-based mass in the left lower lobe. The tumor is surgically resected (selected photomicrographs shown).
Jennifer Boland Froemming, M.D.
Consultant, Division of Anatomic Pathology
Assistant Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine