Placenta
Nonneoplastic placental conditions and abnormalities
Noninfectious
Amnion nodosum


Topic Completed: 1 September 2011

Minor changes: 28 October 2020

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PubMed Search: Amnion nodosum

Mandolin S. Ziadie, M.D.
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Cite this page: Ziadie MS. Amnion nodosum. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/placentaamnionnodosum.html. Accessed January 22nd, 2021.
Definition / general
  • Small deposits on fetal surface
Etiology
  • Seen in placentas affected by oligohydramnios, which may be associated with fetal renal agenesis and pulmonary hypoplasia
  • May be due to desquamated skin or membrane injury
Gross description
  • Multiple yellow tan superficial amniotic lesions, 0.2 to 0.4 cm and usually near insertion of umbilical cord
Microscopic (histologic) description
  • Nodules of protuberant eosinophilic fibrinous material with entrapped squamous cells
  • Associated with stratified squamous metaplasia
Microscopic (histologic) images

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Nodules

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