Placenta - histology slide

Third trimester placenta chorionic villi stained with anti-corticotropin releasing hormone antibody. Higher power view of large polyp-like syncytial knot that is strongly corticotropin releasing hormone positive (red arrows). The nearby syncytium is only lightly stained or negative for corticotropin releasing hormone (pink arrows).

Histology slide and description courtesy of Harvey Kliman M.D., Ph.D.; Yale University School of Medicine.