Figure 1A. The specimen was grey-yellow with a smooth surface and columniform with a length of 15 cm. The mass filled almost the entire ureter lumen with 3 thin pedicles, 0.2 to 0.4 cm wide, connected to the wall, with no invasiveness outside or on the wall.

Figure 1B. Section showing a nodular proliferation of spindle-shaped cells and slitlike vascular spaces associated with intracellular and extracellular red cells. Nuclear atypia and mitotic figures were present (hematoxylin and eosin; original magnification ×400).