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Vet Pathol 40:586-588 (2003)
© 2003 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Equine Placental Teratoma

N. Gurfield and K. Benirschke

Abstract

The placenta from a 300-day–gestational age, female, Arabian equine fetus was examined. Multifocal to coalescing, 0.5- to 4-cm-diameter, white, smooth nodules covered 50% of the placenta. Microscopic evaluation of the nodules revealed undifferentiated germ cells and a haphazard arrangement of immature, mesenchymal stroma, cartilage, squamous cornifying epithelium, scattered ducts and secretory acini lined by cuboidal to columnar epithelium, and mineralized foci. No umbilicus, arrangement about an axial skeleton, or organized polarity of structures was present. The lesion was diagnosed as a placental teratoma, a lesion not reported in species other than man.

Key words: Equine; fetus acardius amorphous; gliomatosis peritonei; placenta; teratoma.

Request reprints from Dr. N. Gurfield, San Diego County Animal Disease Diagnostic Laboratory, Department of Agriculture, Weights and Measures, 5555 Overland Avenue, Building 4, San Diego, CA 92123 (USA). E-mail: nikos.gurfield{at}sdcounty.ca.gov.




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