Fetal Hydrocephalus
Atrium of the lateral ventricle
Greater than 8 mm before 25 weeks
Greater than 10 mm after
Polycystic Ovarian Disease
Greater then 10 mL (l x w x h divided by 2)
12 or more folicles measure 2-9 mm
Ovarian Torsion
Anything larger than 5 cm in any dimension.
Heterogeneous echotexture, more hyperechoic
MSD-CRL <5 mm suggests early oligohydramnios
Multiple gestations: check number of fetal poles and yolk sacs
thin vs thick membrane (twin peak sign shows two chorions)
If two embryo in 1 GS must decide if monoamniotic vs diamniotic
Number of YS= number of amnions
If still early in pregnancy and see two fetal poles and 1 yolk sac, reimage 1-2 weeks cuz the 2nd YS may not be seen.
Embryo period ends week 9, fetal period begins week 10.
No abnormal abdominal defect after 12 weeks.
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