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Mixed neuronal–glial tumor of the digestive tract: Distinctive entity from gastrointestinal stromal tumor?
Author(s) -
Chambonniere MarieLaure,
MosnierDamet Michèle,
Cavillon Christophe,
Mosnier JeanFrançois
Publication year - 2002
Publication title -
pathology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 74
eISSN - 1440-1827
pISSN - 1320-5463
DOI - 10.1046/j.1440-1827.2002.01329.x
Subject(s) - glial fibrillary acidic protein , pathology , cd117 , cd34 , stromal cell , s100 protein , biology , enolase , stromal tumor , immunostaining , immunohistochemistry , neural crest , gastrointestinal tract , medicine , stem cell , microbiology and biotechnology , embryo , biochemistry
A 53‐year‐old‐woman presenting with pelvic discomfort was found to have a 9.5 cm tumor located in the wall of the ileon. Light microscopy showed that the tumor was made of fascicles of plump spindle cells and bizarre epithelioid cells. A cuff of lymphoid cells was also present at the tumor margin. The tumor cells strongly expressed tau protein, neuron‐specific enolase, protein green product 9.5 and glial fibrillary acid protein (GFAP), but did not show positive immunostaining for S‐100 protein, CD34 or CD117. The tumor showed unequivocal ultrastructural evidence of neural differentiation. Skeinoid fibers were scattered throughout the tumor. This is the first mixed neuronal–glial tumor of the digestive tract to be described in the literature. Such histological and immunohistochemical features could be misinterpreted as features of digestive schwannoma. We suggest that this tumor is distinct from gastrointestinal stromal tumors in lacking CD34 and CD117 expression.