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Cases of labor, in which there is a prolongation of the anterior lip of cervix pushed downward before the presenting part, are sufficiently frequent and are easily managed. Exceptional cases, however, occur from time to time wherein the accident is a most undesirable cause of protracted labor. The tissues may be so firm, at the external os, that the cervical walls containing the presenting head will be stretched to an exceedingly thin covering and be caused to protrude between the thighs of the patient.
Dr. Jaentzer describes such a case in the Archives de Tocologie, for May, where a midwife was in attendance. The delayed labor caused the calling in of this physician on a statement that the expansion of the os uteri was complete and that the head of the child was presenting, but that no neck could be felt, by digital examination, on the child above the head,
PROTRUSION OF THE CERVIX UTERI A CAUSE OF DELAYED LABOR.. JAMA. 1890;XV(14):509. doi:10.1001/jama.1890.02410400025006