Correlation of Hydronephrosis Index to Society of Fetal Urology Hydronephrosis Scale

Figure 3

Same kidney 1.5 months later. SFU grade IV hydronephrosis; Calculated HI 27. The dotted line outlines the entire renal area, including renal pelvis [black]   and parenchyma (dark gray). While the SFU grade remained the same, the HI has deteriorated significantly, indicating an actual worsening HN.