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JOURNAL ARTICLE
REVIEW
[Pathoanatomical and clinical aspects of the placenta in preterm birth].
Der Pathologe 2017 July
BACKGROUND: Prematurely born children show a clearly elevated risk for perinatal morbidity, long-term pediatric morbidities and development of chronic diseases in adulthood compared to babies born at term. The pathoanatomical investigation of placentas from preterm births is useful for assessing the etiology, the risk of recurrence and the prognosis for the child.
AIMS: The focus is on presenting the clinical and pathoanatomical characteristics of acute chorioamnionitis as a frequent cause of preterm induction of labor and pregnancy-induced hypertension, in particular preeclampsia as a frequent reason for elective cesarean section. Other lesions, sometimes of unclear etiology associated with preterm birth and substantially elevated risk of recurrence are reviewed. The clinical correlations and therapeutic options of the various diseases are discussed taking the risk of recurrence into consideration.
MATERIAL AND METHODS: Examination of placentas, association with the clinical course and a literature search.
RESULTS AND DISCUSSION: Acute chorioamnionitis and omphalovasculitis can be histologically subdivided into different stages which correlate with the clinical severity and the prognosis for the newborn child. Chronic deciduitis, chronic chorioamnionitis, villitis of unknown etiology, massive perivillous fibrin deposition and chronic histiocytic intervillositis are entities of unclear etiology associated with recurrent abortion and preterm birth. Autoimmune diseases and thrombophilia are occasionally associated with these pathologically defined lesions. Pregnancy-associated hypertensive disease and particularly preeclampsia as the cause of intrauterine developmental delay and elective cesarean section often show characteristic pathoanatomical placental lesions, which can give indications for the severity and duration of the disease and the prognosis for the child. Early onset (<34 weeks of gestation) and late onset preeclampsia show clinical and morphological differences. Subsequent pregnancies are classified as being at risk and screening for preeclampsia should be clinically performed.
AIMS: The focus is on presenting the clinical and pathoanatomical characteristics of acute chorioamnionitis as a frequent cause of preterm induction of labor and pregnancy-induced hypertension, in particular preeclampsia as a frequent reason for elective cesarean section. Other lesions, sometimes of unclear etiology associated with preterm birth and substantially elevated risk of recurrence are reviewed. The clinical correlations and therapeutic options of the various diseases are discussed taking the risk of recurrence into consideration.
MATERIAL AND METHODS: Examination of placentas, association with the clinical course and a literature search.
RESULTS AND DISCUSSION: Acute chorioamnionitis and omphalovasculitis can be histologically subdivided into different stages which correlate with the clinical severity and the prognosis for the newborn child. Chronic deciduitis, chronic chorioamnionitis, villitis of unknown etiology, massive perivillous fibrin deposition and chronic histiocytic intervillositis are entities of unclear etiology associated with recurrent abortion and preterm birth. Autoimmune diseases and thrombophilia are occasionally associated with these pathologically defined lesions. Pregnancy-associated hypertensive disease and particularly preeclampsia as the cause of intrauterine developmental delay and elective cesarean section often show characteristic pathoanatomical placental lesions, which can give indications for the severity and duration of the disease and the prognosis for the child. Early onset (<34 weeks of gestation) and late onset preeclampsia show clinical and morphological differences. Subsequent pregnancies are classified as being at risk and screening for preeclampsia should be clinically performed.
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