Table 3.

The most important anatomical factors correlated to ROV insufficiency.

- absence, hypoplasia or postthrombotic septations of suprarenal or hepatic segment of IVC

- absence or hypoplasia of RRV

- atypical ROV drainage (draining into the main branch of the RRV or accessory RRV)

- high localized ostium of ROV to IVC (on its ventral side)

- distended ostium of the ROV typically draining into the IVC

- lack of an ostial or subostial valve in the ROV trunk

- combined anatomy of the ROV system (e.g., duplication of the ROV trunk)