May 012015
 

Skin mass from a dog

Case information

A 5-year-old male castrated Labrador Retriever was presented for a mass on the right forelimb. The owner first noted the mass about a week ago and noted that it had gotten slightly bigger since that time. The dog had also been seen licking at the lesion. The dermal mass was ~1cm in diameter, round, raised, somewhat firm, and appeared superficially irritated. It was located on the dorsal surface of the 5th digit. The submitting veterinarian performed a fine needle aspirate and submitted Diff Quik®-stained squash prep smears for cytologic evaluation.

  1. What cell types are present?  How would you characterize the inflammation?
  2. What is your interpretation of the cells in Figure 3?
  3. What is the likely source of the inflammation? Where did it originate from?

Figure 1: Skin mass from a dog (Diff-Quik stain, 10x)

Figure 1: Skin mass from a dog (Diff Quik stain, 10x)

Figure 2: Skin mass from a dog (Diff-Quik stain, 20x)

Figure 2: Skin mass from a dog (Diff Quik stain, 20x)

Figure 3: Skin mass from a dog (Diff-Quik stain, 50x)

Figure 3: Skin mass from a dog (Diff Quik stain, 50x)

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