title: Sampling and Definitions of Placental Lesions: Amsterdam Placental Workshop Group Consensus Statement.
abstract: BACKGROUND
  -The value of placental examination in investigations of adverse pregnancy outcomes may be compromised by sampling and definition differences between laboratories.
  
  
  OBJECTIVE
  -To establish an agreed-upon protocol for sampling the placenta, and for diagnostic criteria for placental lesions. Recommendations would cover reporting placentas in tertiary centers as well as in community hospitals and district general hospitals, and are also relevant to the scientific research community.
  
  
  METHODS
  -Areas of controversy or uncertainty were explored prior to a 1-day meeting where placental and perinatal pathologists, and maternal-fetal medicine specialists discussed available evidence and subsequently reached consensus where possible.
  
  
  CONCLUSIONS
  -The group agreed on sets of uniform sampling criteria, placental gross descriptors, pathologic terminologies, and diagnostic criteria. The terminology and microscopic descriptions for maternal vascular malperfusion, fetal vascular malperfusion, delayed villous maturation, patterns of ascending intrauterine infection, and villitis of unknown etiology were agreed upon. Topics requiring further discussion were highlighted. Ongoing developments in our understanding of the pathology of the placenta, scientific bases of the maternofetoplacental triad, and evolution of the clinical significance of defined lesions may necessitate further refinements of these consensus guidelines. The proposed structure will assist in international comparability of clinicopathologic and scientific studies and assist in refining the significance of lesions associated with adverse pregnancy and later health outcomes.
authors.affiliation: From SA Pathology, Women's and Children's Hospital, University of Adelaide, North Adelaide, Australia (Dr Khong); the Department of Pathology, National Maternity Hospital, Dublin, Ireland (Drs Mooney and Kelehan); the Department of Pathology, Hadassah-Hebrew University Medical Center, Mount Scopus, Jerusalem, Israel (Dr Ariel); the Department of Pathology, Kennemer Gasthuis, Haarlem, the Netherlands (Dr Balmus); the Department of Pathology, Boston Children's Hospital, and the Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts (Dr Boyd); the Departments of Pathology and Laboratory Medicine, and Pediatrics, University of Calgary, Calgary, Alberta, Canada (Dr Brundler); the Maternal & Fetal Health Research Centre, University of Manchester, Manchester Academic Health Science Centre, Manchester, United Kingdom (Ms Derricott); the Department of Pathology, Royal Infirmary of Edinburgh, Edinburgh, United Kingdom (Dr Evans); the Department of Pathology, University of Alabama at Birmingham, (Dr Faye-Petersen); the Department of Pathology, Rotunda Hospital, Dublin, Ireland (Dr Gillan); the Institute of Human Development, Faculty of Medical and Human Sciences.
authors.forename: T Yee
authors.initials: TY
authors.lastname: Khong
authors.forename: Eoghan E
authors.initials: EE
authors.lastname: Mooney
authors.forename: Ilana
authors.initials: I
authors.lastname: Ariel
authors.forename: Nathalie C M
authors.initials: NC
authors.lastname: Balmus
authors.forename: Theonia K
authors.initials: TK
authors.lastname: Boyd
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Brundler
authors.forename: Hayley
authors.initials: H
authors.lastname: Derricott
authors.forename: Margaret J
authors.initials: MJ
authors.lastname: Evans
authors.forename: Ona M
authors.initials: OM
authors.lastname: Faye-Petersen
authors.forename: John E
authors.initials: JE
authors.lastname: Gillan
authors.forename: Alex E P
authors.initials: AE
authors.lastname: Heazell
authors.forename: Debra S
authors.initials: DS
authors.lastname: Heller
authors.forename: Suzanne M
authors.initials: SM
authors.lastname: Jacques
authors.forename: Sarah
authors.initials: S
authors.lastname: Keating
authors.forename: Peter
authors.initials: P
authors.lastname: Kelehan
authors.forename: Ann
authors.initials: A
authors.lastname: Maes
authors.forename: Eileen M
authors.initials: EM
authors.lastname: McKay
authors.forename: Terry K
authors.initials: TK
authors.lastname: Morgan
authors.forename: Peter G J
authors.initials: PG
authors.lastname: Nikkels
authors.forename: W Tony
authors.initials: WT
authors.lastname: Parks
authors.forename: Raymond W
authors.initials: RW
authors.lastname: Redline
authors.forename: Irene
authors.initials: I
authors.lastname: Scheimberg
authors.forename: Mirthe H
authors.initials: MH
authors.lastname: Schoots
authors.forename: Neil J
authors.initials: NJ
authors.lastname: Sebire
authors.forename: Albert
authors.initials: A
authors.lastname: Timmer
authors.forename: Gitta
authors.initials: G
authors.lastname: Turowski
authors.forename: J Patrick
authors.initials: JP
authors.lastname: van der Voorn
authors.forename: Ineke
authors.initials: I
authors.lastname: van Lijnschoten
authors.forename: Sanne J
authors.initials: SJ
authors.lastname: Gordijn
mesh_terms: D032921:Consensus; D005260:Female; D006801:Humans; D010920:Placenta / Q000473:pathology*; D010922:Placenta Diseases / Q000175:diagnosis* / Q000473:pathology; D011247:Pregnancy; D013048:Specimen Handling / Q000379:methods*