Figure 3a: Computerized tomographic scan of the mass in the region of the carotid body in a dog with metastatic mast cell tumor (right medial iliac lymph node) and chemodectoma (spleen)

The mass is evident on one side of the neck (black arrow). A metastatic lesion is present in the brain (arrowhead). It is unclear if the metastasis was from the chemodectoma or metastatic mast cell tumor, but the former was considered more likely.

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