69.下圖為上腹部超音波影像,箭號所指的低回音圓形構造為何?

(A)左腎靜脈(left renal vein)
(B)上腸繫膜動脈(superior mesenteric artery)
(C)上腸繫膜靜脈(superior mesenteric vein)
(D)脾動脈(splenic artery)
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統計: A(210), B(1567), C(268), D(518), E(0) #1838377
統計: A(210), B(1567), C(268), D(518), E(0) #1838377