What is intracranial translucency?
The intracranial translucency (IT) is a recently introduced marker of open spina bifida (OSB). In this study, we describe a case of a fetus affected by Blake’s pouch cyst which showed alterations of BS/BSOB ratio at the first trimester screening.
Can NT scan detect neural tube defects?
The scan uses ultrasound to screen for Down syndrome, or other chromosomal or inherited conditions in the foetus. Other non-chromosomal conditions, such as neural tube defects, abdominal wall defects, limb abnormalities and some congenital heart disease, can also be detected at this stage of the pregnancy.
What is the meaning of nuchal translucency?
Definition. The nuchal translucency test measures the nuchal fold thickness. This is an area of tissue at the back of an unborn baby’s neck. Measuring this thickness helps assess the risk for Down syndrome and other genetic problems in the baby.
What are normal measurements for nuchal translucency?
What is a normal nuchal translucency measurement? An NT of less than 3.5mm is considered normal when your baby measures between 45mm (1.8in) and 84mm (3.3in) . Up to 14 weeks, your baby’s NT measurement usually increases as they grow.
What is abnormal nuchal translucency?
The fetal NT increases with gestational age/crown–rump length. Due to this the NT measurement may considered abnormal when it is above 3.0 mm, or above the 99th percentile for the gestational age.
Where is the intracranial translucency on an ultrasound?
Ultrasound image in the mid-sagittal plane of the fetal face showing the nasal bone, palate, mandible, nuchal translucency (NT), thalamus (T), midbrain (M), brain stem (B) and medulla oblongata (MO). The fourth ventricle presents as an intracranial translucency (IT) between the brain stem and the choroid plexus.
Does intracranial translucency at 11–13+6weeks predict open spina bifida?
The fourth ventricle, seen as intracranial translucency (IT) at 11–13+6weeks, has been reported to be obliterated in cases of open spina bifida (OSB). Our aim was to assess its role in detecting OSB at 11–13+6weeks. Materials and Methods: This prospective study was conducted at foetal medicine unit from January 2014 to June 2015.
Is intracranial translucency a marker for OSB in first trimester?
Fourth ventricle is seen as intracranial translucency (IT) between 11 and 13+6weeks of gestation. Obliterated IT has been identified as a marker for ONTD.[6,7] The objective of this study was to assess the role of IT for detecting OSB in the first trimester.
How is fetal nuchal translucency measured?
The latter relies on accurate measurement of the fetal nuchal translucency (NT) thickness and assessment of the nasal bone, which necessitates examination of the mid-sagittal view of the fetal face 4, 5 .