case_images: PMC10637163_01
case_images: CTU: A plain scan showed that the left renal pelvis and calyces showed a slightly high-density shadow, with a CT value of about 62HU, a size of about 2.6 cm*1.5 cm, and blurred edges, mainly in the middle and lower poles of the renal pelvis and calyces B and C. Enhanced scan showed that mild-to-moderate enhancement was found at the edge of the lesion; after enhancement, the left renal cortex in the lower pole was diffusely low enhanced. Excretion phase showed a decrease in parenchymal density and a filling defect adjacent to the calyx.
case_images: 10.1177_03946320231214117-fig1.jpg
case_images: PMC10637163_01_10.1177_03946320231214117-fig1.jpg
case_images: fig1-03946320231214117
case_images: CTU (see Figure 1): Left kidney occupied with hemorrhage and adjacent calyx involved.
case_images: MRI: A and B plain scan MRI showed that irregular mass abnormal signal was observed in the lower calyx of the left kidney, with the largest slice size of about 3.8 mm x 3.1 mm. The lesions were cast, with short T1 and slightly long T2 signals, slightly high signal on DWI, and low signal on ADC. C Enhanced MR showed that mild enhancement of heterogeneity and decreased perfusion of adjacent renal parenchyma were observed after enhancement.
case_images: 10.1177_03946320231214117-fig2.jpg
case_images: PMC10637163_01_10.1177_03946320231214117-fig2.jpg
case_images: fig2-03946320231214117
case_images: Enhanced MR (see Figure 2) showed abnormal signal in the lower calyx area of the left kidney, and the secondary bleeding or mucus of low-grade malignant tumor became suspicious.
case_images: Pathological hints: (staining, H & E; magnification, x100): The arrow is renal venous malformation with bleeding and thrombosis. The lesion is located in the renal medulla, involving the renal calyx, with rupture and bleeding of the renal calyx, and local bleeding of surrounding renal tissue is obvious.
case_images: 10.1177_03946320231214117-fig3.jpg
case_images: PMC10637163_01_10.1177_03946320231214117-fig3.jpg
case_images: fig3-03946320231214117
case_images: Pathology (see Figure 3) suggests that renal venous malformation (size 2.2 cm*2.5 cm*1.1 cm), with bleeding and thrombosis.