[CK] RA mass, pseudotumor and Fetal circulation.

arterial blood: Umblical vein -> DUCTUS VENOSUS(shunt) to IVC -> Rt. heart
                        -> RA to LA: FORAMEN OVALE(shunt)
                        -> RV to PA to Aorta: DUCTUS ARTERIOSUS(shunt)
3 shunting system; supplying mixed blood!!!!

drainage system: femoral artery level -> Umbilical artery -> to placenta.(mixed blood. not fully dirty blood like adult)

-------------------------------
RA DDX.

3.Pseudotumor(3)-crista terminalis, eustachian valve(thebesian valve as well)(remnant= chiari network)
4.Thrombus
5.Myxoma(15% compared to LA - m/c)
6.fibrofatty change(interseptal around SVC)
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7.rarely cancer(RCC)
8.atrifact
------------------------------ no need for gadolinium enhancement per CMR(Dr. Hundley)