Excavation (medicine)

In medicine, excavation has two meanings:
 * the act of hollowing out
 * the space hollowed out, or a natural cavity or pouch

Examples of the latter include:
 * Rectouterine pouch or excavation, between the uterus and the rectum
 * Rectovesical excavation, between the rectum and the male bladder
 * Vesicouterine excavation, between the bladder and the uterus in a female