Merck Manual

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Low-grade fibrosarcoma in muzzle, dog
Low-grade fibrosarcoma in muzzle, dog

These classic tumors on the muzzle are confusing in that in the biopsy report "nodular fasciitis" seems benign and does not indicate their slowly expanding biological behavior. This tumor's locally infiltrative nature caused severe disfigurement and discomfort for this Golden Retriever as it continued to enlarge.

Courtesy of Dr. Alice Villalobos.

In these topics
Connective Tissue Tumors