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. 2019 Mar 1;111(1):13–17. doi: 10.32074/1591-951X-26-17

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© 2019 Copyright by Società Italiana di Anatomia Patologica e Citopatologia Diagnostica, Divisione Italiana della International Academy of Pathology

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Fig. 1. — A) Macroscopic appearance the placenta and umbilical cord. A large cystic mass of 10 cm in greatest diameter can be appreciated in the umbilical cord close to the placental insertion. B) On histological examination, the cystic mass consisted of a single layer of eosinophilic cells. Myxoid degeneration of the cystic wall can also be appreciated. C) Higher magnification of the cyst reveals a single layer of amnionic epithelial cells with flattened or cuboidal morphology (arrow). The epithelial origin of the cyst is confirmed by positive immunostain for pan-cytokeratin antibody (clone AE1/AE3) (inset; D).