A 64 Year Old Man with a 60 Pack Year

A 64 year old man with a 60 pack year smoking history was seen by his local physician for fatigue.He also reported having lost 20 pounds over the previous two months,while eating his normal diet.Chest x-ray disclosed a 4 cm mass near the left lung hilum.An endoscopic biopsy was performed,a representative section of which is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

A) Adenocarcinoma
B) Bronchioloalveolar carcinoma
C) Carcinoid tumour
D) Large cell undifferentiated carcinoma
E) Small cell carcinoma
F) Squamous cell carcinoma

Correct Answer:

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