A Case Report of a Renal Mixed Epithelial and Stromal Tumor in a Heterozygous S1P2 Receptor Deficient Mouse(Pathology)

32週給のS1P2遺伝子ヘテロ欠損雌性マウスに発生した腎複合上皮間質腫瘍(MESTK)について報告する.本病変は,尿細管様の管腔を形成する上皮成分およびそれらを取り囲む間質成分から成る二相性腫瘍であり,免疫染色において上皮成分はサイトケラチンに,間質成分はビメンチンおよび平滑筋マーカーにそれぞれ陽性であった.これらの結果から,ヒトWHO分類の診断基準に基づいて本症例はMESTKであると診断した. We report a case of mixed epithelial and stromal tumor of the kidney (MESTK) in a 32-week-old heterozygous sphingosine l-phosphate-2 (S1P2) receptor deficient female mouse. A white solid mass replacing the left kidney was observed at the left retroperitoneal wall. Histologically, the tumor mass consisted of dimorphic cellular components of epithelial and stromal cells. Epithelial cells formed various sized irregular-shaped tubular structures resembling renal tubules surrounded by stromal cells. Immunohistochemically, epithelial cells were positive for cytokeratin, while stromal cells showed positive immunoreactivity with a-smooth muscle actin as well as vimentin. Based on the morphological and immunohistochemical findings, this tumor was diagnosed as a MESTK

A Case Report of a Renal Mixed Epithelial and Stromal Tumor in a Heterozygous S1P2 Receptor Deficient Mouse

金沢大学医薬保健研究域医学系We report a case of mixed epithelial and stromal tumor of the kidney (MESTK) in a 32-week-old heterozygous sphingosine 1-phosphate-2 (S1P2) receptor deficient female mouse. A white solid mass replacing the left kidney was observed at the left retroperitoneal wall. Histologically, the tumor mass consisted of dimorphic cellular components of epithelial and stromal cells. Epithelial cells formed various sized irregular-shaped tubular structures resembling renal tubules surrounded by stromal cells. Immunohistochemically, epithelial cells were positive for cytokeratin, while stromal cells showed positive immunoreactivity with α-smooth muscle actin as well as vimentin. Based on the morphological and immunohistochemical findings, this tumor was diagnosed as a MESTK