62. Classifications Used for Grading Prenatal Hydronephrosis According to the
Anteroposterior Diameter of the Pelvis
Degree
Blachar y Blachar[11,12]
Barker et al.[16]
Normal
0 - 4mm
0 - 5mm
Mild dilatation
5 - 9mm
6 - 10mm
Moderate dilatation
10 - 14mm
11 - 14mm
Severe dilatation
15mm or more
15mm or more
63. Table 2: Degrees of Ultrasonographic Hydronephrosis
According to the Society for Fetal Urology[9]
Degree
Ultrasound findings
1
Visualization of the pelvis
2
Dilated pelvis and there could be a dilated calyx
3
Dilated pelvis and calyxes
4
Dilated pelvis and calyxes with thinning of the parenchyma