Assessing normal and abnormal pregnancy from 4-10 weeks
[Pages:49]Assessing normal and abnormal pregnancy from 4-10 weeks
Monique Haak
ISUOG's basic training curriculum
Goals 4-10 week assessment by US
? Normal appearance gestational sac (GS), yolk sac (YS) and embryo
? Assessment of mean sac diameter (MSD) and CRL ? Viability criteria and terminology in non-viable pregnancy ? Recognition of ectopics, principles of pregnancy of unknown
location (PUL) ? Role hCG and management of PUL ? Molar pregnancy
ISUOG's basic training curriculum
Conception and implantation
ISUOG's basic training curriculum
Embryo from 0-8 weeks
ISUOG's basic training curriculum Source: The Virtual Human Embryo Project
Implantation-> gestational sac
1st evidence pregnancy on ultrasound; completely embedded blastocyst 14 d post conception
ISUOG's basic training curriculum NEJM 2001;345/1400
Gestational sac
? Small, round fluid collection inside uterine cavity ? Normally positioned in mid-to upper uterine cavity ? Surrounded by a hyperechogenic rim ? Visible at approximately 4 weeks gestation ? Beware of difference in gestational age and embryo
age
ISUOG's basic training curriculum
Location of gestational sac within upper half of uterus
ISUOG's basic training curriculum
40 weeks - 2 mm
ISUOG's basic training curriculum
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