Embedded Corpus Luteum.
Comparison of an embedded corpus luteum in the left ovary with a normal CL in the right specimen. Normally the ovulation papilla (crown) can be palpated. When there is no distinct crown the CL may be difficult to identify. The presence of a mature CL can be confirmed with ultrasonography and / or progesterone determination in the milk or plasma.
Drost M (1971)