Ultrasonography of a pregnant female's uterus shows 'Snow storm appearance', which is indicative of:

Characteristic echogram of molar pregnancy is 'snow storm' appearance due to multiple small sonolucencies due to the hydropic villi. Fetal tissues and amniotic sac are absent. In contrast, sonographic features of a paial molar pregnancy include a thickened, hydropic placenta with a concomitant fetus. Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 37. Gestational Trophoblastic Disease. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver (Eds), Williams Gynecology, 2e.