Items tagged “first trimester”
13 results found
Article
Missed miscarriage
A missed miscarriage, sometimes termed a missed abortion 3, is a situation when there is a non-viable fetus within the uterus, without symptoms of a miscarriage.
Radiographic features
Ultrasound
Ultrasound diagnosis of miscarriage should only be considered when either a mean gestation sac d...
Article
Yolk sac
Yolk sac is the first anatomical structure identified within the gestational sac. It plays a critical role in embryonal development by providing nutrients, serving as the site of initial haematopoiesis, providing endocrine, metabolic and immunological functions and contributing to the developmen...
Article
Fetal heart beat
Fetal heart beat can be detected as early as 34 days (just under 6 weeks) gestation on good quality, high frequency transvaginal ultrasound, as a crown rump length (CRL) of as little as 1-2 mm.
If a fetal heartbeat cannot be identified with a CRL ≥7 mm using transvaginal scanning, then embryona...
Case
Failed early pregnancy
Published
05 Aug 2010
91% complete
Ultrasound
Article
Complete hydatidiform mole
A complete hydatidiform mole (CHM) is a type of molar pregnancy and falls at the benign end of the spectrum of gestational trophoblastic disease.
Epidemiology
A complete hydatidiform mole is the commonest type of gestational trophoblastic disease.
Pathology
Complete moles are characterised ...
Article
Pregnancy of unknown location
The term pregnancy of unknown location (PUL) is assigned when neither an intrauterine pregnancy (IUP) or an ectopic pregnancy is identified on transvaginal ultrasound in the context of a positive pregnancy test.
Clinical presentation
pelvic pain
vaginal bleeding
positive pregnancy test
Path...
Case
Subchorionic haemorrhage
Published
29 Dec 2012
54% complete
Ultrasound
Article
Calcified yolk sac
A calcified yolk sac has been described as a sign of intrauterine demise. The cause of yolk sac calcification in failed pregnancies is uncertain but is likely related to dystrophic calcification.
Radiographic features
Ultrasound
abnormal increased echogenicity of the yolk sac with posterior a...
Case
Amniotic membrane
Published
12 Jun 2015
94% complete
Annotated image
Case
Fetal rhombencephalon
Published
12 Jun 2015
63% complete
Ultrasound
Annotated image
Article
Echogenic yolk sac
An echogenic yolk sac is an indeterminate finding in first-trimester fetal ultrasound. It differs from a calcified yolk sac, in that the contents of the yolk sac are echogenic, not just the rim.
One study has suggested that this finding is associated with fetal demise, but other reports in the ...
Case
Fetal rhombencephalon
Published
15 Jun 2015
75% complete
Annotated image
Ultrasound
Article
Fetal tricuspid regurgitation
Tricuspid regurgitation (TR) (also known as tricuspid insufficiency) is a common finding in imaging of the fetus. Tricuspid regurgitation represents the abnormal backflow of blood into the right atrium during right ventricular contraction due to valvular leakage (i.e. it is a valvulopathy).
Ep...