Feb 012016

Cutaneous mass from a cat

Case information 

A 12 year-old female spayed cat presented for evaluation of a mass on the dorsal right cervical area. The mass was first noticed by the owners 3 weeks after a vaccine against Rabies was applied on the same location.

On presentation, the cat was bright, alert, and responsive and all her vital parameters were within normal limits. On physical examination, a 2.6 x 2.0 x 1.3 cm subcutaneous and movable mass on the right aspect of the dorsal cervical region was palpated. The rest of her physical examination was unremarkable.

Blood samples were obtained and submitted for a complete blood cell count and biochemistry panel and only revealed a mild hyperproteinemia (8.3 g/dL, reference interval, 5.9-7.5 g/dL). Thoracic radiographs and abdominal ultrasound were unremarkable. A computed tomography (CT) revealed a small non-discrete lesion above her right cervical area. A fine needle aspirate of the mass was obtained and submitted for cytologic evaluation.

Examine the representative images that are provided below and answer the following questions.

  1. How would you classify the inflammation present?
  2. What is the most likely origin of the pale to medium purple material indicated by the arrows in Figure 3 (also present in Figure 1 and Figure 2)?
  3. Given the clinical history, signalment and cytologic findings, what is the most likely cause of the inflammation?


Figure 1: Mass aspirate (Wright’s stain, 50x)


Figure 2: Mass aspirate (Wright’s stain, 50x)


Figure 3: Mass aspirate (Wright’s stain, 50x)

Answers on next page 

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