Ovarian and Foetal Imaging Flashcards
Dating of ultrasound scans in pregnancy is done using the LMP/Date of conception
LMP
Week __ of a pregnancy scan will correlate with conception/ovulation
2
By week 6-7 of pregnancy scanning what structures are you expecting to see?
- Gestation sac
- Yolk sac
- Embryo
A normal gestation sac should lie just under the ___ and be positioned slightly ___
Endometrium
Eccentric
If the developing baby hasn’t doubled in size by weeks ___ the pregnancy is considered failed
6-7
What is a threatened abortion?
bBeeding and cramping in the first 20 weeks of a pregnancy
If there foetal cardiac activity is absent by a CRL of > __mm this is considered pathologic
7
If the embryo is absent by a MSD (mean sac diameter) of ___mm this is considered pathologic
25
What is a normal embryonic heart rate?
140-150 bpm
What is the prognosis for a subchorionic bleed?
Unlikely to be problematic because is not where the embryo is developing
The yolk sac normally measures __mm
4
How should you refer to an anembryonic pregnancy in clinical practice?
An empty sac
Why is free-floating amnion before 12 weeks of scanning not necessarily indicative of a miscarraige?
Amnion does not stick to the chorion until around 12 weeks
Which condition causes a marked increase in likelihood of ectopic pregnancy?
Pelvic inflammatory disease
Should you only scan the uterus for an IVF pregnancy?
No - higher chance of ectopic pregnancy, need to scan outside the uterus
Is fluid around the uterus more indicative of an ectopic or ovulation?
Ecotopic
Which drug is used in the termination of pregnancy?
Methotrexate
Where does fluid due to ovulation tend to collect?
The pouch of Douglas
Ovaries are normally ___ cm in size
2.5-3cm
Ovarian follicles may rupture between ___mm
16-25
What are the ddx for fluid in the pouch of douglas and pelvic pain?
- Ectopic pregnancy
- Ovulation
- Menstruation (blood)
- PID (pus)
What causes a haemorrhagic corpus luteum?
Rupture of blood vessels on the ovary post-ovulation
Corpus luteum is responsible for hormonal control of pregnancy until ___ weeks
10-12
What is a common presentation of patients with gestational trophoblastic disease?
Severe sickness - excessive vomiting to the point of being unable to keep up with fluids
