Batson's venous plexus are veins without valves that run paravertebrally from pelvic region up into the dural sinuses. Thus, they are a common mode of metastasis of prostate and breast cancer to the vertebrae and the brain. Because of the drainage of urinary system, urinary tract infections like pyelonephritis have been shown to spread to cause osteomyelitis of the vertebrae. The osteomyelitis in such a case will resolve concurrently with the same antibiotic that treats the urinary tract infection because both infections are from the same organism.