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Ultrasound detected seven (30.4%, 7\/23) primitive trigeminal arteries (PTA), eight (100%, 8\/8) primitive hypoglossal arteries (PHA), and four (100%, 4\/4) proatlantal intersegmental arteries (PIA). PHA and PIA can be observed as abnormal branches arising from the internal or external carotid artery, most likely accompanied by hypoplastic vertebral arteries with low velocities and high resistances. 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