A 63-year old woman presented in November 2007 with a productive cough, dyspnea, and hoarseness. She had been previously evaluated by her primary care physician and treated with two courses of antibiotics for pneumonia without significant improvement. Her past medical history was unremarkable, with the exception of a 60 pack-year smoking history. Physical examination was significant for decreased breath sounds in the left upper hemithorax. A chest x-ray identified a 10-cm mass in the left upper lobe, with tracheal compression ( Fig 1A). The patient underwent a computed tomography (CT) scan of the chest, which revealed a 10-cm necrotic mass abutting and invading into the aortopulmonary window, with associated left hilar lymphadenopathy indicative of a primary lung cancer.A CT-guided biopsy was performed. The tumor had the histopathological appearance of a high-grade sarcoma (Fig 2A). Immunohistochemistry was negative for cytokeratin (AE1/AE3), S-100, smooth muscle actin, desmin, epithelial membrane antigen, and CD34, but positive for vimentin, CD56, CD57, collagen 4, and neurofilament. These results were consistent with a high-grade, malignant, peripheral nerve sheath tumor. A staging positron emission tomography (PET)/CT scan showed no evidence of extrapulmonary disease (Fig 1B).The patient was subsequently referred to our multidisciplinary sarcoma center and was evaluated by a multidisciplinary team, which