A 54-Year-Old Man Comes to the Office Due to Several

A 54-year-old man comes to the office due to several episodes of coughing up bloody sputum.  The patient has also noticed weight loss, anorexia, constipation, increased thirst, and fatigue.  He smoked 2 packs of cigarettes daily for 32 years but quit last month.  Vital signs are within normal limits.  The patient appears slim and pale.  Physical examination is otherwise normal.  Laboratory results are as follows: Chest x-ray shows a left-sided hilar mass.  Whole-body bone scan is normal.  Histopathology of the hilar mass is most likely to reveal which of the following?

A) Adenocarcinoma of the lung
B) Sarcoidosis
C) Small cell carcinoma of the lung
D) Squamous cell carcinoma of the lung
E) Tuberculosis

Correct Answer:

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