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Comparison of Doppler ultrasound images from sibling 1 (A,C) and sibling 2 (B,D). A: Splenic vein with a spontaneous splenorenal shunt; B: Splenic vein with collateral vessels at the hilum, without porto-systemic shunts; C: Dilated and tortuous vessels, collateral circulation and a spontaneous splenorenal shunt; D: Absence of a splenorenal shunt.
