First Trimester
Double decidual sign confirms what?
Intrauterine pregnancy
Free fluid in the cul-de-sac, absent IUP, corupus luteum cyst are sonographic findings for a/n ________
Ectopic pregnancy
What ultrasound patterns can describe a hydatidiform mole?
Lacey or snowstorm pattern
Which biometric parameter is relied on heavily to help estimate the fetal weight?
Abdominal Circumference
Bilateral occlusion of the internal carotid arteries can cause
Hydranecephaly
What is a bleed between the endometrium and gestational sac called?
Subchorionic hemorrhage
Where do ectopic pregnancies occur 95% of the time?
Ampulla of the fallopian tube
What is the most common form of GTD?
Complete Hydatidiform mole
What is polyhydraminos? What is oligohydramnios?
Polyhydramnios - too much fluid
Oligohydramnios - too little fluid
Lemon-sign and banana sign are associated with
Arnold-Chiari Malformation
What is the vitelline duct
It connects the yolk sac to the embryo
Slower than with a normal IUP
What mole contains both normal and hydropic chorionic villi?
Partial/incomplete mole
Fetal genitalia can sometimes be seen after 16 weeks, but it is more reliable after approximately _____ weeks and how can you tell the difference between male and female?
Failure of the prosencephalon to divide into two separate hemispheres results in ________
CRL can be used until what week?
Week 12
What is a rare type of ectopic where the gestation sac is implanted in the anterior part of the LUS?
Cesarean Scar Pregnancy
What is the malignant metastatic trophoblastic disease?
Choriocarcinoma
What does the echogenic midline linear echo that divides the two hemispheres in a transverse image of the brain represent?
Falx cerebi
Agenesis/hypoplasia of the cerebellar vermis and posterior fossa cyst communicating with the fourth ventricle are two findings in _______
Dandy-Walker malformation
hCG is produced by _________ which prevents the corpus luteum from degenerating
Early placenta
Why would an interstitial ectopic cause more severe hemorrhage than an ampullary ectopic?
Cornual/interstital site has a richer blood supply and can allow the pregnancy to grow larger before rupturing
What do the small cystic spaces in a molar pregnancy represent?
Hydropic chorionic villi
What measurements can you take at the level of the CSP and thalami?
HC and BPD
What are two types of spina bifida and what are differences between the two?
Meningocele-Meninges only protrube
Meningomyelocele-Meninges and spinal cord protrude