bifurcation countThe number of terminating arms in a collateral system with a single origin, which has the complexity of a collateral network. For example, a collateral with 2 terminating arms stemming from the bifurcation would have a bifurcation count (BC) equal to 2. If 1 of these arms went on to again bifurcate, the BC for the collateral system would be equal to 3. A collateral that does not bifurcate is a single terminating arm and has a BC equal to 1. This reflects the fact that this collateral has bifurcated once at its origin from the parent artery. Increasing BCs reflect increasing complexity of the collateral network. There is no upper limit to the BC in a single collateral system.
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