PMC6197143_01
Both the fetuses A and C were thin and pale while the fetus B was heavy and red.
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An external examination showed that fetuses A and C were thin and pale, while fetus B was heavy and red (Figure 1).
Internal organs showed that fetuses A and C presented anaemia changes (A and C). The fetus B performed congestion and haemorrhage of organs (B).
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Observation of the internal organs showed that fetuses A and C suffered anaemic changes (Figure 2(A,C)). However, fetus B presented congestion and haemorrhage of the organs (Figure 2(B)). 
(A) The umbilical cord of recipient's (a) was dark while that of donor's (b and c) were pale. The hatched lines indicated relatively symmetrical triplet placenta portions of the single placental disc. (B) There were two types of anastomosis in MC placenta: the superficial AAA (red arrow) and deep AVA (black arrow).
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Examination of the MC placenta indicated that the umbilical cord of the recipient performed differently with the donor (Figure 3(A)). Two types of vascular anastomoses, including arterio-arterial anastomosis (AAA) and arterio-venous anastomosis (AVA), were observed in the placenta (Figure 3(B)). 
(A and C) Anaemia area of the placenta: relatively large immature villi and interstitial edema. (B) Hyperaemia area of the placenta: villi were mature with congestive interstitial telangiectasia. Syncytiotrophoblast nucleus degenerated, concentrated and gathered into multi-core nodules.
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We observed relatively large and immature villi with interstitial oedema in the anaemic area of the placenta (Figure 4(A,C)). Furthermore, syncytiotrophoblast nuclei were degenerated, concentrated and gathered into multi-core nodules (Figure 4(B)). 