1,812 results found
Article
11-13 week antenatal scan
11-13 week antenatal (nuchal translucency) scan is considered a routine investigation advised for fetal well-being as well as for early screening in pregnancy (see antenatal screening).
It includes multiple components and is highly dependent on the operator. Traditionally three factors are used...
Case
1st trimester nuchal/morphology ultrasound
Published
08 Feb 2018
54% complete
Ultrasound
Article
3D ultrasound
Three-dimensional (3D) ultrasound is a technique that converts standard 2D grayscale ultrasound images into a volumetric dataset. The 3D image can then be reviewed retrospectively. The technique was developed for problem-solving (particularly in obstetric/gynecologic exams) and to potentially re...
Article
Aarskog syndrome
Aarskog syndrome or Aarskog–Scott syndrome (also known as the facio-digito-genital syndrome) is a rare anomaly characterized by short stature in association with a variety of structural anomalies involving mainly the face, distal extremities, and external genitalia.
Epidemiology
Population pre...
Article
Aase-Smith syndrome
Aase-Smith syndrome (or Aase syndrome) is an extremely rare congenital disorder characterized by anemia and skeletal deformity.
Epidemiology
Aase-Smith syndrome has a prevalence of less than 1 per 1,000,000 persons. There have only been 20 reported cases.
Clinical presentation
congenital hyp...
Article
Abdominal distension (mnemonic)
A mnemonic for causes of abdominal distension (6 Fs) is:
F: fat
F: fluid
F: flatus
F: feces
F: fetus
F: fulminant mass
Case
Abdominal ectopic pregnancy
Published
06 Jul 2022
71% complete
CT
Article
Abdominal ectopic pregnancy
Abdominal ectopic pregnancies are an extremely rare type of ectopic pregnancy.
Epidemiology
They are thought to represent ~1% of all ectopic pregnancies 6 with an estimated incidence of 1:1000-10,000 births.
Pathology
It is often thought that they most frequently result from a tubal rupture ...
Case
Abdominal lymphoma - sandwich sign
Published
20 May 2017
77% complete
CT
Article
Abdominal pain in pregnancy protocol (MRI)
The abdominal pain in pregnancy MRI protocol encompasses a set of MRI sequences for assessment of causes of non-traumatic abdominal pain in pregnancy.
Note: This article aims to frame a general concept of an MRI protocol for the assessment of the abdomen in pregnancy. Protocol specifics will va...
Case
Abdominal wall endometriosis post C-section
Published
13 Nov 2012
83% complete
CT
Case
Abdominal wall endometriosis with round ligament connection
Published
23 Sep 2019
80% complete
MRI
Article
Abdominoschisis
Abdominoschisis (plural: abdominoschises) refers to a split or defect in the abdominal wall. Some authors use the term synonymously with a gastroschisis. When the defect continues into the thoracic region it is termed a thoracoabdominoschisis. A large abdominoschisis is considered part of the li...
Case
Aberrant right subclavian artery (ARSA)
Published
16 Oct 2019
69% complete
Ultrasound
Article
Abnormal ductus venosus waveforms
Abnormal ductus venosus waveforms can arise in a number of conditions ranging from aneuploidy to vascular malformations and fetal tumors. "A wave" reversal can be seen in 5% of euploid fetuses 9.
Pathology
Abnormal waveforms in fetal ductus venosus flow assessment can occur in a number of situ...
Article
Abnormally eccentric gestational sac
An eccentrically-located gestational sac towards the fundus of the uterus is the normal sonographic appearance, however, an abnormally eccentric gestational sac on ultrasound may be apparent due to a number of causes:
interstitial ectopic pregnancy 1
normally implanted pregnancy in a
bicornu...
Article
Abnormally low sac position
An abnormally low sac position can result from several possibilities which include
impending/ongoing miscarriage
cervical ectopic pregnancy
Cesarean scar ectopic pregnancy
fundal fibroid or other mass compressing the sac downward
Article
Abnormally thickened endometrium (differential)
Abnormally thickened endometrium on imaging may occur for a number of reasons which may be categorized based on whether or not they are related to pregnancy. Etiologies may also be classified based on whether the patient is premenopausal or postmenopausal.
Differential diagnosis
Pregnancy-rela...
Case
Absent ductus venosus
Published
28 Jan 2016
79% complete
Ultrasound
Article
Absent ductus venosus
Agenesis of the ductus venosus (ADV) is a rare fetal vascular anomaly.
Epidemiology
According to the data obtained from the screening tests performed at 11-14 weeks of pregnancy, its incidence is reported to be 1/2500 12.
Pathology
In a large case series, Acherman et al. 13 defined five drai...
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