Merck Manual

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Undifferentiated sarcoma in medial right thigh, spayed female Golden Retriever
Undifferentiated sarcoma in medial right thigh, spayed female Golden Retriever

This large firm mass was fixed to underlying musculature. Because there was no guarantee for achievable margins without nerve damage, this dog was treated with intralesional chemotherapy.

Courtesy of Dr. Alice Villalobos.