partial mole can be diagnosed by a combination of the following sonographic findings : ( a ) greatly enlarged placenta relative to the size of the uterine cavity , ( b ) cystic spaces within the placenta ( `` '' molar placenta '' '' ) , which may not always be present , ( c ) an amniotic cavity ( gestational sac ) , either empty or containing amorphous fetal echoes , and ( d ) a well-formed but growth-retarded fetus , either dead or alive .
C0334529
partial mole
C0032043
placent