<prompt> A 49-year-old man suffering from carcinoma of the prostate was x -rayed. He showed areas of sclerosis and collapse of T10 and T11 vertebrae in x-ray. The spread of this cancer to the above vertebrae was through -Sacral canalLymphatic vesselsInternal vertebral plexus of veinsSuperior rectal vein  <response>: Prostatic cancer spreads to the bones through blood vessels; first into Batsons periprostatic venous plexus and then into the internal vertebral plexus of veins.This metastasis is possible because of valveless communication between the periprostatic and vertebral plexus of veins. 