Hemangiopericytoma are common malignant neoplasms of the skin and subcutaneous tissue of dogs.
These tumors are often locally invasive of underlying connective tissue, muscle but rarely metastasize.
Diagnosis may be made tentatively by visualization, but confirmation requires histological analysis of biopsied material. Regional lymphadenopathy does not appear to be a feature of this tumor.
Microscopically, hemangiopericytomas have a characteristic 'fingerprint pattern' appearance, composed of multiple layers of spindle cells arranged in a concentric whorls that often surround a central blood vessel.
The mitotic index is reported to be correlated with recurrence, mean patient survival, and metastasis of this tumor.
Treatment usually requires aggressive local excision. Recurrence is not uncommon and adjunct radiation therapy may be required.
Visceral hemangiopericytomas usually require surgical resection
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