AN INTRAMURAL PREGNANCY is separate from the uterine cavity and tube or round ligament and is completely surrounded by uterine musculature. There is no demonstrable aperture connecting the pregnancy in the wall of the uterus with the endometrial cavity. The continued growth of a pregnancy within the confines of the uterine musculature creates a condition in which impending rupture of a large part of an unusually vascular uterine wall is always present.
Intramural pregnancy should not be confused with a pregnancy associated with sacculation, diverticulum, or congenital anomaly of the uterus. A sacculation of a pregnant uterus is a transitory pouch or sac-like structure developing from a portion of the uterus. The wall of the sacculation is composed of all three layers of the uterine corpus with an excessively thinned out layer of myometrium that is continuous with the normal myometrium of the remainder of the corpus. The aperture connecting
McGowan L. Intramural Pregnancy. JAMA. 1965;192(7):637-639. doi:10.1001/jama.1965.03080200055023