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 of the direct smear of the fine needle aspirate of the lung nodule is provided.

Which of the following is the most likely diagnosis?