Primary omental tumor with ultrastructural features of cellular schwannoma and absence of S-100 antigen reactivity.
We report a primary well-delimited, large mesenchymal omental neoplasm which appeared in a 58 year old man without neurofibromatous traces. The histological and ultrastructural features were consistent with a Schwann cell origin. However, repeated immunohistochemical reactions failed to demonstrate protein S-100 antigen reactivity in the neoplastic cells, the latter only expressing vimentin. The differential diagnosis with hemangiopericytoma is proposed.
Martorell
M A
MA
Dept. of Pathology, Medical School, University of Valencia, Spain.
Calabuig
M C
MC
Llombart-Bosch
A
A
Esquerdo
J
J
D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009442:Neurilemmoma / Q000378:metabolism / Q000648:ultrastructure*; D009852:Omentum / Q000473:pathology*; D010534:Peritoneal Neoplasms / Q000473:pathology*; D009418:S100 Proteins / Q000378:metabolism*
D009418:S100 Proteins