March 2018 Case of the Month

“Pulmonary mass” in a dog

Case Information

A 6 year old mixed breed dog presented for difficulty breathing. A single pulmonary mass was identified, and a fine-needle aspirate collected and submitted for cytological evaluation. CBC and biochemical panel results were unremarkable. Images of the aspirate are shown below:

Figure 1: Aspirate of pulmonary mass. Wright’s stain 4x.

Figure 2: Aspirate of pulmonary mass. Wright’s stain 50x.

Figure 3: Aspirate of pulmonary mass. Wright’s stain 50x.

Figure 4: Aspirate of pulmonary mass. Wright’s stain 50x.

Questions:

1) What is the major cell type seen in this aspirate?
2) Take a close look at image 4, what second population of cells is evident?
3) How do you reconcile these findings with a lesion in the thoracic cavity?

Answers on next page

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