A 49-year-old woman undergoes a biopsy of a 4-cm lesion in the upper lobe of her left lung. Examination under light microscopy shows cells containing pleomorphic and hyperchromatic nuclei within irregularly shaped glands. There is invasion into the pulmonary parenchyma and lymphovascular spaces. Which of the following is the most likely diagnosis?
Adenocarcinoma
Carcinoid tumor
Hamartoma
Large cell carcinoma
Oat cell carcinoma
Squamous cell carcinoma
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Cut-to-the-chase Answer (0:27):
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HY USMLE Answer (7:31):
