Placental calcifications

A biophysical and histologic study
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      Thirty human placentas from cases with various types of pregnancy complications and 20 placentas from normal pregnancies were examined by microradiography. Four different types of calcification could be distinguished by this method: (1) large strongly radiopague confluent calcifications on the maternal surface, (2) small weakly radiopague flakelike calcifications within the placenta, (3) veiled weakly radiopaque calcifications within the parenchyma, and (4) perivascular weakly radiopaque calcifications. No type was found to be specifically related to any pathologic disorder. X-ray diffraction examination of the first two types showed that they consisted mainly of calcium hydroxyapatite.
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