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Uterine incarceration
Uterine incarceration is an obstetrical complication whereby a growing retroverted uterus becomes wedged into the pelvis after the first trimester of pregnancy.
==Development==
When the uterus is tilted backwards, it is considered to be retroverted; this situation is common and regarded a normal variation. It has been estimated that about 15% of pregnancies begin in a retroverted uterus. Normally, during the first trimester, the growing uterus changes spontaneously to an anteverted position, thus allowing expansion of the enlarging uterus into the abdomen. The cervix is then inferior to the body of the uterus. Thus, the presence of an early pregnancy in a retroverted uterus is not considered a problem.〔
On rare occasions the uterus fails to become anteverted, and the pregnancy continues to expand the retroverted uterus within the confines of the pelvis. By about 14 weeks the size of the uterus fills out most of the pelvis, pushing up the cervix. At this point the uterus may get trapped below the sacral promontory and symphysis. With further growth the pregnant woman may experience lower abdominal and pelvic pain, back pain, and difficulty, even inability to void, as the bladder is pushed upward and its outflow becomes obstructed. Constipation may be encountered.
The frequency of this complication has been estimated to be about 1 in 3,000 pregnancies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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