title: The ultrasound appearance of tumor extension into the left renal vein and inferior vena cava.
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D012082:Renal Veins; D014463:Ultrasonography; D014682:Vena Cava, Inferior