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KEY TERMS

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Key Terms

  1. Endomyometritis: puerperal infection involving the endometrium and myometrium, usually involving multiple bacterial organisms including gram-positive and gram-negative enteric organisms and anaerobic bacteria. The patient usually manifests fever and uterine tenderness and is postpartum, especially after a cesarean.

  2. Hepatic subcapsular hematoma: bleeding into the liver parenchyma leading to a collection of blood distending the liver capsule. This condition, a complication of preeclampsia, puts the patient at risk for hematoma rupture and life-threatening bleeding.

  3. Ovarian vein thrombosis: a condition where pelvic veins involving the gonadal vein have a thrombus (clot), which is usually infected. The patient usually presents with fever and lateral abdominal pain and may have a palpable pelvic mass.

  4. Placenta accreta: abnormal adherence of the placenta to the uterine lining, usually due to abnormal placental penetration into large fragments of the decidual layer of the endometrium. This condition is increased by the number of prior cesareans and placenta previa.

  5. Postpartum hemorrhage: bleeding after delivery traditionally exceeding 500 mL on a vaginal delivery, and 1000 mL on a cesarean delivery. Early postpartum hemorrhage is less than 24 hours after the delivery, and late postpartum hemorrhage means exceeding 24 hours after delivery.

  6. Puerperium: the time after delivery until 6 weeks postpartum.

  7. Retained placenta: substantial amount of chorionic villi and products of conception retained in the uterus, typically causing bleeding or infection.

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INTRODUCTION

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During pregnancy, numerous dramatic physiologic changes take place. After delivery, whether by the vaginal or cesarean route, these changes resolve even more rapidly. This process of resolution of the pelvic organs occurs during the puerperium, which is the 6 weeks following delivery. In 1972, Robinson first described the use of diagnostic ultrasound to image the postpartum pelvic organs.1 Since that time, ultrasound has continued to play an important role in the diagnosis of postpartum anatomical structures, particularly in conditions of infection, hemorrhage, or suspected retained placenta; processes that require imaging include assessment of women with persistent postpartum endomyometritis, pelvic abscesses, retained placental fragments, and hematomas of the uterus, bladder, peritoneal flap, or abdominal wall. Such complications can involve up to 5% to 10% of postpartum women.2

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This chapter reviews normal and pathologic sonographic findings during the puerperium, with the major emphasis on the pelvic organs, although the urinary tract, hepatobiliary tract, and vasculature are also covered. The normal anatomy, including variations of normal, and the changes associated with pregnancy and further alterations by the various disorders are reviewed.

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THE GYNECOLOGIC ORGANS

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Normal Anatomy

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The Uterus
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In the nonpregnant state, the uterus usually occupies a midline position that measures approximately 8 cm in length. Uterine size may be affected by parity and pathologic conditions such as leiomyomata or adenomyosis.3 The uterus grows from a pregravid weight of 140 g to a peak of 1 kg at term; the uterine blood flow increases ...

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