The accessory artery in essential hypertension.

Ninety hypertensive patients were investigated by intravenous pyelography, abdominal aortography, and renal biopsy. Accessory arteries were present in four of thirty-nine patients with secondary hypertension, whereas sixteen of fifty-one patients with primary hypertension exhibited this anomaly. These differences in distribution are statistically significant, and the relationship between accessory arteries and primary hypertension is discussed.