Differentiating points between ICA and ECA on MR Angiogram
Caliber : ICA relatively larger in diameter than ECA.
Branches in neck: Look for the side branches, a branch arising from the vessel it has to be ECA as ICA gives no neck branches.
Alignment : ECA is in alignment with CCA where as ICA has a sharp angulation at its origin and then ascend upward, this is to reduce chances of ascend of emboli from CCA into ICA intra cranially.
Bulbar portion: a mild smooth dilatation involving proximal most portion of ICA near its origin is normal bulbar portion.
Location : on cross sectional row images ICA is anterio medial to ECA.
Branches in neck: Look for the side branches, a branch arising from the vessel it has to be ECA as ICA gives no neck branches.
Alignment : ECA is in alignment with CCA where as ICA has a sharp angulation at its origin and then ascend upward, this is to reduce chances of ascend of emboli from CCA into ICA intra cranially.
Bulbar portion: a mild smooth dilatation involving proximal most portion of ICA near its origin is normal bulbar portion.
Location : on cross sectional row images ICA is anterio medial to ECA.
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