| dc.description.abstract | Peripheral nerve sheath tumors (PNSTs) comprise a heterogeneous group of neoplasms
originating from the elements of the nerve sheath. They are divided into two forms:
benign and malignant PNST. Both benign and malignant PNSTs are not very common
in domestic animals but they are reported in different animal species. Histologically,
PNSTs are composed predominantly of spindle cells arranged in bundles, whorls and
sheets, with a different number of pleomorphic cells and mitotic fi gures.
The aim of this study was a reclassifi cation of 17 dog tumor samples initially diagnosed
with peripheral nerve sheath tumors using histopathological analysis. The main criterion
for reclassifi cation was immunohistochemical positivity for various antigens.
PNSTs are often histologically very similar to other spindle cell tumors and
immunohistochemistry is required for differential diagnosis. PNSTs generally express
vimentin, S-100 protein, glial fi brillary acidic protein (GFAP), collagen IV and laminin.
Four tumor samples were positive to muscular marker α-SMA and vimentin and
negative for S-100 protein and desmin. The spindle cells whirling around some blood
vessels were observed in these tumors so they were reclassifi ed as perivascular wall
tumors (PWTs). The other 13 tumors were S-100 protein and vimentin positive and
α-SMA and desmin negative, thus classifi ed as PNST.
The use of the immunohistochemical panel is necessary for distinguishing PNSTs from
PWTs in routine diagnostics. | en_US |
