impacted fetus

im·pact·ed fe·tus

a fetus that, because of its large size or narrowing of the pelvic canal, has become wedged and incapable of spontaneous advance or recession.

im·pact·ed fe·tus

(im-pak'tĕd fē'tŭs)
A fetus that, because of its large size or narrowing of the pelvic canal, has become wedged and incapable of spontaneous advance or recession.