PMC6008004_01
Oblique (A) and axial (B) CT views: a tumour with solid and cystic components in the left kidney. Filling defect in the left renal vein and vena cava inferior
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fig1
The tumour was invading into the collecting system and forming a 55 x 13 mm tumour thrombus in the left renal vein and in the inferior vena cava (IVC) (Fig. 1).
Biological material from the first surgery. Histopathological examination: a tumour composed of stromal (spindle-shaped cells) and epithelial (medium-sized cystic and tubular structures) components (H&E, x20)
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fig2
The tumour predominantly was composed of a solid mass and some small cystic components in the periphery (Fig. 2).
Biological material from the first surgery. Immunohistochemical analysis: positive immunohistochemical reactions for desmin (C: x10), smooth muscle actin (D: x10), and progesterone receptors (E: x20) in the stromal component
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fig3
B, GFAP, and oestrogen receptors (Fig. 3). The epithelial component was negative for CD10. Both histological and immunohistochemical features of the thrombus were similar to a primary tumour.