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Basal plate plaque: a novel organising placental thrombotic process
  1. Brendan Fitzgerald1,2,
  2. Patrick Shannon1,2,
  3. John Kingdom1,3,4,
  4. Sarah Keating1,2,3
  1. 1Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
  2. 2Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Canada
  3. 3Department of Obstetrics and Gynaecology, University of Toronto, Toronto, Canada
  4. 4Department of Obstetrics and Gynaecology, Mount Sinai Hospital, Toronto, Canada
  1. Correspondence to Dr Sarah Keating, Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario M5G 1X5, Canada; skeating{at}


In contrast to thrombi and haematomas at other body sites, thrombi in the placental intervillous space are not traditionally known to undergo organisation. This report presents 11 examples of a form of organising thrombotic process that develops as a plaque on the foetal aspect of the basal plate. Originally identified in the placenta of a foetus showing severe intrauterine growth restriction, further examples of this lesion, which we term a ‘basal plate plaque’, show a spectrum of placental involvement. Small lesions appear to occur at points of localised stasis at the basal plate (eg, at edges of anchoring villi or in small basal plate depressions). Large areas of involvement, as seen in the original case, may be pathological markers of more generalised disturbances in placental circulation or of hypercoagulability in the intervillous space. Large basal plate plaques may therefore prove to be diagnostically significant and should be reported.

  • Basal plate
  • basal plate plaque
  • organising thrombus
  • placenta
  • pregnancy
  • thrombosis

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  • Competing interests None.

  • Ethics approval Access to health record data for research purposes was granted by the Mount Sinai Hospital Research Ethics Board (reference 10-0259-C).

  • Provenance and peer review Not commissioned; externally peer reviewed.

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