A collision tumor consisting of granular cell tumor and adenocarcinoma in the uterus of an aged djungarian hamster.
A neoplastic nodular lesion consisting of an admixture of granular cell tumor and adenocarcinoma was found in the uterus of a 26-month-old Djungarian hamster. Neoplastic cells of the uterine adenocarcinoma showed an epithelial nature in their growth patterns and by cytokeratin-immunopositive reaction, exhibiting nuclear pleomorphism. The granular cells had an abundant amount of fine granular eosinophilic cytoplasm and eccentric or central nuclei with no nuclear atypia; the granular structures were positive for periodic acid-Schiff with diastase resistance and were confirmed as lysosomes/autophagosomes by electron microscopy; immunohistochemically, the cells reacted to desmin, vimentin and α-smooth muscle actin and negatively for neurogenic, histiocyte/macrophage or epithelial markers, indicating smooth muscle origin. Because these tumors were generated from different cell origins, a diagnosis of collision tumor was made.
Hossain M
HM
Golbar
Takeshi
T
Izawa
Mitsuru
M
Kuwamura
Kensaku
K
Okamura
Daisuke
D
Fujita
Yukari
Y
Tagami
Hiroshi
H
Sasai
Jyoji
J
Yamate