Assistant principals aid the principal in the overall administration of the school. Some assistant principals hold this position for several years to prepare for advancement to principal jobs; others are career assistant principals.n larger school systems, a principal is often assisted by someone known as a vice-principal (Republic of Ireland: deputy principal) or assistant principal.
Causes. Pressure on the bladder during delivery is the main cause of a ruptured bladder, although a weakness in the bladder wall may make it susceptible to a rupture. In older horses, a ruptured bladder may be caused by an accident or related to a urinary obstruction.
Causes can include urinary tract infection, prostate infection, kidney stones, kidney disease, or bladder cancer. Simple things like vigorous exercise can also cause microscopic blood in the urine. Depending on the age, a cystoscopy or IVP can be considered to evaluate the urinary tract and bladder, a CT scan be done to evaluate for kidney stones, and an ultrasound be done to examine the kidney stucture.