Three cases of canine gastrointestinal stromal tumors with multiple differentiations and c-kit-expression.
Three canine gastrointestinal stromal tumors (GISTs) were examined. Histopathologically, the tumor mass in the jejunum (Case 1) consisted of the proliferation of epithelioid cells with abundant eosinophilic or vacuolated cytoplasm. Gangliocyte-like or multinucleated giant cells were scattered. The tumor cells exhibited neural natures mimicking human gastrointestinal autonomic nerve tumors, which were immunopositive for several neuronal markers. Another jejunal mass (Case 2) was composed by a solid proliferation of spindle-shaped cells, arranging in interlacing fascicles and occasional storiform pattern. The tumor seemed to be classified undifferentiated GISTs, that showed no apparent neural or muscular features by ultrastructural and immunohistochemical examinations. In the pyloric mass (Case 3), the spindle cells having eosinophilic processes and elongated nuclei were arranged in sheets. Immunohistochemically, the tumor cells showed muscular natures as regards alpha smooth muscle actin and desmin expression.
Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki, Japan.
Kazuyoshi
K
Kumagai
Kazuyuki
K
Uchida
Toru
T
Miyamoto
Takahiro
T
Ushigusa
Syusaku
S
Shinohara
Ryoji
R
Yamaguchi
Susumu
S
Tateyama
D000818:Animals; D002454:Cell Differentiation; D002455:Cell Division; D004283:Dog Diseases / Q000235:genetics / Q000473:pathology*; D004285:Dogs; D004847:Epithelial Cells / Q000473:pathology; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000235:genetics / Q000473:pathology / Q000662:veterinary*; D008297:Male; D019009:Proto-Oncogene Proteins c-kit / Q000235:genetics*; D017154:Stromal Cells / Q000473:pathology*
D019009:Proto-Oncogene Proteins c-kit