What is the normal diameter of the external carotid artery (ECA)?

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Multiple Choice

What is the normal diameter of the external carotid artery (ECA)?

Explanation:
The external carotid artery has a small caliber in adults, reflecting its role in supplying the face and neck through many branches. Its diameter is in the range of a few millimeters, which is smaller than the internal carotid artery that feeds the brain. This small, modest size is the hallmark of a normal ECA on imaging. If you see a clearly larger diameter, it’s not typical for the ECA and may indicate measurement artifact or a different vessel; a diameter that’s too small would also be atypical. Therefore, a modest, small caliber best fits a normal external carotid artery.

The external carotid artery has a small caliber in adults, reflecting its role in supplying the face and neck through many branches. Its diameter is in the range of a few millimeters, which is smaller than the internal carotid artery that feeds the brain. This small, modest size is the hallmark of a normal ECA on imaging. If you see a clearly larger diameter, it’s not typical for the ECA and may indicate measurement artifact or a different vessel; a diameter that’s too small would also be atypical. Therefore, a modest, small caliber best fits a normal external carotid artery.

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