MSD Manual

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Mast cell tumor, dog
Mast cell tumor, dog

    Photograph of a Boston Terrier with a mast cell tumor infiltrating the left inguinal lymph node. Notice the bruising and ecchymosis. The original tumor appeared as a fleshy skin tag on the left caudal thigh for 3 years before it metastasized.

Courtesy of Dr. Alice Villalobos.