Mitty H A, Schapira H E
J Urol. 1977 May;117(5):557-61. doi: 10.1016/s0022-5347(17)58534-1.
The cobra-shaped distal ureter is not pathognomonic of a ureterocele. It may be seen with incomplete distal ureteral obstruction owing to tumor or calculus. The appearance of the wall surrounding the dilated distal ureteral segment is a more important finding to differentiate a ureterocele and a pseudoureterocele. The wall of a ureterocele is thin, while the lucency surrounding a pseudoureterocele is thicker and poorly defined.
输尿管远端呈眼镜蛇头样改变并非输尿管囊肿的特征性表现。在因肿瘤或结石导致输尿管远端不完全梗阻时也可能出现这种表现。区分输尿管囊肿和假性输尿管囊肿时，扩张的输尿管远端节段周围壁的表现是更重要的发现。输尿管囊肿的壁薄，而假性输尿管囊肿周围的透亮区较厚且边界不清。
