THE ABNORMAL THREE VESSEL (TRACHEA) VIEW

1. Three vessels present. Color flow in both vessels antegrade or retrograde.

2. Three vessels present. Color flow in one vessel.

3. Three vessels present. Abnormal arrangement of vessels.

4. Three vessels present. Abnormal location of the trachea.

5. Four vessels present.

6. Two vessels present

Abnormal vessel size	Aorta smaller than PA	HLHS
		Critical AS
		Coarctation of aorta
	PA smaller than aorta (RV outflow tract obstruction)	Tetralogy of Fallot
		Tricuspid valve dysplasia
	Enlarged PA and aorta	Polyvalvular dysplasia syndrome
	Enlarged SVC	Interruption of IVC / azygous continuation
Abnormal arrangement of vessels -distorted left to right vessel order	c-TGV	Transverse aortic arch located to left of and anterior to main PA
	DORV
Abnormal number of vessels	2 vessels	Truncus arteriosus Aortic / pulmonary atresia.
	4 vessels	Persistent left SVC
Abnormal relationship between transverse aortic arch and trachea	Trachea between PA and transverse aortic arch	Right aortic arch (associated with Intracardiac anomalies, microdeletion 22q11, and vascular rings).
Reversed flow in a vessel	Transverse aortic arch	Aortic atresia / critical stenosis
	Pulmonary artery	Pulmonary atresia
		DORV
Turbulent flow in a vessel	Transverse aortic arch dilated	Aortic stenosis
	Pulmonary artery dilated	Pulmonary stenosis
Laminar flow in both vessels	Normal aorta and PA	Normal
	Small PA	PS + shunting
		Ebstein’s
		TA + VSD
		Tetralogy + mild PS
	Small Aorta	Coarctation of the aorta
		Tubular hypoplasia of the aorta
		Normal variant