Case 36
Author: Dr. Manon Auger, Dept of Pathology, McGill University, Montreal, Canada
Reviewer: Ritu Nayar, MD., Northwestern University, Feinberg School of Medicine, Chicago, IL, USA
A 76 year old man presented with a nodule in the left lower lobe of the lung. Significant past medical history: previously resected colonic adenocarcinoma. A virtual slide and 7 static images (Papanicolaou-stained slides) of the direct smear of the fine needle aspirate of the lung nodule are provided.
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| Fig.1. Papanicolaou stain, 200X |
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| Fig.2. Papanicolaou stain, 600X |
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| Fig.3. Papanicolaou stain, 200X |
 Fig.4. Papanicolaou stain, 600X |
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| Fig.5. Papanicolaou stain, 400X |
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| Fig.6. Papanicolaou stain, 400X |
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| Fig.7. Papanicolaou stain, 400X |
Which of the following is the most likely diagnosis?