case_images: PMC11110504_01
case_images: Sagittal and axial abdominopelvic computed tomography-scan in parenchymal phase: Pure liquid retroperitoneal mass (arrow) pushing the kidney against the anterior abdominal wall (black arrowhead). Note the well-defined thin septa (blue arrowhead).
case_images: 10.1177_2050313X241253748-fig1.jpg
case_images: PMC11110504_01_10.1177_2050313X241253748-fig1.jpg
case_images: fig1-2050313X241253748
case_images: The mass had well-defined, regular contours with a thin wall and a dense fluid content with multiple thin septa that enhanced faintly after injection of contrast medium (Figure 1).
case_images: Axial abdominal computed tomography-scan in delayed phase performed at 15 min and 2 h: Bilateral pelvic dilation more pronounced on the left (arrows). At 15 min (a), the measured density was 3.3 Hounsfield Units (HU), increasing 2 h later to 22 HU, proof of a slow and progressive filling of the fluid mass by the contrast agent (b).
case_images: 10.1177_2050313X241253748-fig2.jpg
case_images: PMC11110504_01_10.1177_2050313X241253748-fig2.jpg
case_images: fig2-2050313X241253748
case_images: Delayed acquisitions performed at 15 min and 2 h after revealed a slow, progressive, and partial filling of the mass by the contrast medium (Figure 2).
case_images: Ultrasound showing a thin-walled anechoic cyst containing multiple septa (arrow), displacing the kidney forward. Note the pyelo-calyceal dilation (arrowhead).
case_images: 10.1177_2050313X241253748-fig3.jpg
case_images: PMC11110504_01_10.1177_2050313X241253748-fig3.jpg
case_images: fig3-2050313X241253748
case_images: Ultrasonography showed an anechogenic cystic mass containing multiple fine septa with a fishnet-like appearance (Figure 3), indicating chronicity of the urinoma and the origin of its partial, heterogeneous filling.