“…Improved obstetrical and gynxcological practice may partly explain the paucity of more recent reports, which precludes the potentially useful contrast of early spontaneous uterine rupture with that occurring at or about full term unider conditions of modern medical practice. In these few reports, spontaneous uterine rupture in the first and second trimesters, as later in pregnancy, has been reported as a sequel to Coesarean section 5,14 and to other operations which may be supposed to lead to scars in the myometrium.9 ' …”