Cystic Placental Mole.

Cystic Placental Mole.
This is a highly unusual cystic placental mole that followed embryonic death, after which the placenta continued to grow to the size of 3 to 4 month pregnancy; with retention of the corpus luteum. This condition should not be confused with a hydatidiform mole which accompanies a live calf.

Roberts SJ (1973)