fetal cardio-thoracic circumference ratio
Fetal cardiothoracic (C/T) circumference ratio is a parameter than can be used in assessment of fetal cardiac and thoracic/chest wall anomalies. It is the ratio of the cardiac circumference to the thoracic circumference and may be easily measured on fetal ultrasound/echocardiography.
Radiographic features
Ultrasound/echocardiography
The C/T circumference ratio should be always <0.5 throughout gestation. It slowly increases throughout gestation:
- ~11 weeks: 0.38
- ~17-20 weeks: 0.45
- term: 0.5
Increased C/T circumference ratios can be observed with either cardiac or thoracic pathology:
- cardiac: fetal cardiomegaly
- thoracic: pulmonary hypoplasia
See also
Siehe auch:
