3) Malignancies include gastrointestinal stromal tumors (GISTs), leiomyosarcomas, liposarcomas, fibrosarcomas
, pleomorphic undifferentiated sarcomas, and hemangiopericytomas.
The most common examples include papillomas, SCC, myxomas, fibromas and fibrosarcomas
[2, 11, 12].
1 and 2) tumors varied from small masses of one centimetre diameter in extragenital TVT to extensive growths throughout the oral cavity in fibrosarcomas
About 5-10% of fibrosarcomas
arise in the head and neck, nose and paranasal sinuses, with skin and subcutaneous tissue being the prime location.
in birds have been described from the integumentary and musculoskeletal systems, (5,7,2,13) as well as a wide variety of visceral organs.
Las principales neoplasias reportadas en ovario de peces comprenden tumores de celulas tecales y granulosas, disgerminomas, teratomas, adenocarcinomas, leiomiomas, fibromas, fibrosarcomas
, linfosarcomas y PEComas (1, 2, 11, 16, 21, 23) .
5) These tumors have an intermediate biological behavior between benign fibrous lesions and fibrosarcomas
Malignant tumors in the differential diagnosis include fibrosarcomas
and spindle cell carcinomas.
and myofibroblastic fibrosarcomas
have similar cytoplasmic and nuclear features to hemangiopericytoma, but similarly to PNST, tumor cells exhibit a whorl pattern around a collagenous center, but lack concentric perivascular whorls (GOLDSCHMIDT & HENDRICK, 2002; GROSS et al.
Other relatively common types of canine skin cancers include melanomas, which form in pigmented skin cells; fibrosarcomas
, which form in fibrous tissue; and hemangiopericytomas, which form near blood vessels.
25) Inflammatory leiomyosarcoma contains fascicles of spindle cells with a dominant smooth muscle immunophenotype whereas the presence of long sweeping fascicles and a 'herringbone' appearance distinguish I-IMFTs from congenital/infantile fibrosarcomas
Immunohistochemical Expression of Vascular Endothelial Growth Factor and Vascular Endothelial Growth Factor Receptor in Canine Cutaneous Fibrosarcomas