There are many types and causes of head injury, but, by far, the most common are concussions related to motor vehicle accidents and contact sports. Concussion comes from the Latin âConcutereâ, which means to shake violently.
Noun. 1. pyelonephritis-inflammation of the kidney and its pelvis caused by bacterial infection. urinary tract infection-any infection of any of the organs of the urinary tract. acute pyelonephritis-pyelonephritis resulting from the spread of a bladder infection.
1 Pyelonephritis (infection of kidney pelvis): Bacteria may infect the kidney, usually causing back pain and fever. 2  A spread of bacteria from an untreated bladder infection is the most common cause of pyelonephritis.