Fluid & Brush Quiz 1 This 59 year-old white male smoker presents to the pulmonary clinic with a history of recent onset of hemoptysis.  He has been seen for several years because of COPD.  Bronchoscopy reveals an intraluminal mass.  A bronchial brush and biopsy are performed.  The following images are from the thin prep of the brush.  The most probable diagnosis is:

A Benign lymphocytes.

B Inconclusive.

C Malignant, non-small cell carcinoma.

D Malignant, small cell carcinoma.