PMC8461116_01
(a and b) Transvaginal ultrasonography showed a mass of abnormal blood vessels with a mixture of arterial and venous flow in the uterine cavity uterine cavity on color Doppler, suggesting uterine arteriovenous malformation. (c and d) Transvaginal ultrasonography showed a swollen blood vessel as well as "To and fro sign (yin-yang sign)" in color Doppler.
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Transvaginal ultrasonography showed a mass of abnormal blood vessels with a mixture of arterial and venous flows in the uterine cavity (Figure 1(a) and (b)), suggesting uterine arteriovenous malformation (UAVM), and a saccular dilatation of blood vessels and "to and fro sign (yin-yang sign)" were observed on color Doppler (Figure 1(c) and (d)).
(a) 3D-CTA on the 22nd day of puerperium. A pseudoaneurysm 6.3 mm in diameter (red arrow) is recognized at the dilated right uterine arteries. (b) 3D-CTA on the 27th day of puerperium. The pseudoaneurysm grew to 12.7 mm in diameter (red arrow).
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This revealed dilated blood vessels in the uterus on the right side and an accompanying pseudoaneurysm with a diameter of 6.3 mm (Figure 2(a)). Since the pseudoaneurysm had grown to 12.7 mm (Figure 2(b)), interventional radiology hemostasis was performed to avert the rupture of the pseudoaneurysm.
(a) Selective right uterine arteriography on 27th day of postpartum. The abnormally dilated right uterine arteries and pseudoaneurysm (red arrow) were embolized with gelatin sponge particles. (b) Right internal iliac arteriography after embolization. The right uterine arteries and pseudoaneurysm disappeared.
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The dilated right uterine artery and pseudoaneurysm (Figure 3(a)) were embolized with gelatin sponge pledgets (Figure 3(b)).