PMC9845871_01
Abdominal radiography and ultrasonography revealed: (A) enlarged unilateral kidney in the right lateral view, (B) a right renomegaly confirmed in ventrodorsal view, (C) transverse image of the right kidney demonstrated severe renal pelvic dilation (calipers), (D) dilatation of right proximal abdominal ureter (calipers), and (E) right proximal ureter dilatated (white arrow) and tapered abruptly (black arrow).
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F1
On the abdominal radiography (ROTANODE E7884X, Toshiba Electron Tubes & Devices CO., LTD., Tokyo, Japan), right renomegaly was confirmed (Figures 1A, B). Dilatation of the right renal pelvic (1.91 cm at its greatest diameter) and the right proximal ureter (0.35 cm at its greatest diameter) were present (Figure 1C). The dilated proximal ureter extended about 1.45 cm and then narrowed abruptly (Figure 1D). The caudal ureter was indistinct (Figure 1E).
Transverse MPR post-contrast reconstructions from cranial (A) to caudal (I) of the abdomen using a soft tissue algorithm at 30 s after contrast. It indicated that the right circumcaval ureter ran (white arrow) dorsally to the caudal vena cava. After that, it ran medially and then ventrally toward the gap between the caudal vena cava (blue dot) and abdominal aorta (red dot).
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F2
It ran dorsally toward the caudal vena cava at this level and continued ventrally between the aorta and the caudal vena cava at the level of sixth lumbar vertebrae (L6), finally inserted into the urinary bladder (Figure 2).
Dorsal oblique MPR post-contrast reconstructions and 3D volume rendering image of the abdomen before and after the antegrade pyelography. (A) Before the antegrade pyelography, the dilated right proximal ureter (long arrow) and taper distal ureter (short arrow) was detected. (B) 0 min after the puncture. (C) 5 min after the puncture. Distal ureter was not filled with contrast material and tapered (short arrow). (D) 3D volume rendering image showed the shapes of renal pelvis after the antegrade pyelography.
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F3
The CT scans of the kidney were performed at 0 min and 5 min after the puncture, respectively (Figure 3).