Sala M A, Matheus M
Department of Pathology, School of Dentistry of Ribeirão Preto, Brazil.
Arch Gynecol Obstet. 1989;246(1):51-6. doi: 10.1007/BF00933077.
The authors describe the histological features of the placenta in a typical case of twin-to-twin transfusion, with particular attention focused on the stereologic aspects. Villi from the anemic placental portion were slightly edematous, with small and inconspicuous vessels. The stereologic characteristics of this portion were nearer values of normal placentas. The plethoric region appears as a postmature organ, with a very thin trophoblast layer and numerous vasculo-syncytial membranes. The most dramatic alterations of this region were mainly related to the foetal capillary. According to the stereologic results, the consecutive circulatory alterations would facilitate the maternal-fetal exchanges in the plethoric placental territory, thus justifying the greater development of this twin.
作者描述了双胎输血典型病例中胎盘的组织学特征，尤其关注其立体学方面。贫血胎盘部分的绒毛轻度水肿，血管细小且不明显。该部分的立体学特征更接近正常胎盘的值。充血区域表现为一个过熟器官，滋养层非常薄且有大量血管合体膜。该区域最显著的改变主要与胎儿毛细血管有关。根据立体学结果，连续的循环改变将促进充血胎盘区域的母胎交换，从而解释了这一双胞胎发育得更大的原因。
