Merck Manual

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Hemangiopericytoma over the lateral right thorax, older Black Labrador
Hemangiopericytoma over the lateral right thorax, older Black Labrador

Hemangiopericytomas can become very large. They recur after incomplete excision or complete excision with narrow, inadequate margins.

Courtesy of Dr. Alice Villalobos.

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Connective Tissue Tumors