case_images: PMC5538086_01
case_images: Growth of tumor mass around and inside the hemisected kidney; tumor mass, in light brownish color, is encapsulating most of the kidney (C), infiltrating inside the pelvis (B) without reaching the yellowish medulla and cortex (A).
case_images: OpenVetJ-7-214-g001.jpg
case_images: PMC5538086_01_OpenVetJ-7-214-g001.jpg
case_images: F1
case_images: The tumor is well demarcated and distinguished from the normal renal tissue; it encapsulates the outside of the kidney and infiltrates inside the renal pelvis but it does not expand to the renal parenchyma (Fig. 1).
case_images: Hematoxylin and eosin stained kidney tissue section reveals Neoplastic cells arranged in bundles and in streams (100x). The black arrow points at a dense area (Antoni A) and the blue arrow points at a looser area (Antoni B).
case_images: OpenVetJ-7-214-g002.jpg
case_images: PMC5538086_01_OpenVetJ-7-214-g002.jpg
case_images: F2
case_images: Most of the neoplastic cells were arranged in dense bundles with increased cellularity like Antoni A areas of a classic schwannoma, and some in loosely arranged streams of cells like Antoni B (Fig. 2).
case_images: Hematoxylin and eosin stained kidney tissue section shows spindle and oval Neoplastic cells with cartilaginous islets at the middle (400x).
case_images: OpenVetJ-7-214-g003.jpg
case_images: PMC5538086_01_OpenVetJ-7-214-g003.jpg
case_images: F3
case_images: There were heterologous elements in form of cartilaginous islets (Fig. 3).
case_images: Immunohistochemistry (IHC) shows tumor cells are diffusely immunoreactive for S-100 antibody (dark brown). (40x). The dark brown area is an indication for a positive reaction for S-100 antibody (A), where (B) indicates the negative reaction.
case_images: OpenVetJ-7-214-g004.jpg
case_images: PMC5538086_01_OpenVetJ-7-214-g004.jpg
case_images: F4