Table 1 Distribution of kidney anomalies in 331 fetuses
Types of fetal kidney anomalies | n | Isolated anomalies n (%) | Nonisolated anomalies n (%) | |
|---|---|---|---|---|
with soft markers | with additional anomalies c | |||
Malformations of the renal parenchyma a | 149 | 93 (62.4) | 18 (12.1) | 38 (25.5) |
Anomalies of the urinary collecting system | 116 | 74 (63.8) | 13 (11.2) | 29 (25.0) |
 Hydronephrosis | 80 | 53 (66.3) | 6 (7.5) | 21 (26.3) |
 Duplex kidney | 36 | 21 (58.3) | 7 (19.4) | 8 (22.2) |
Abnormal embryonic migration of the kidneys | 61 | 38 (62.3) | 10 (16.4) | 13 (21.3) |
 Ectopic kidney | 42 | 25 (59.5) | 7 (16.7) | 10 (23.8) |
 Horseshoe kidney | 19 | 13 (68.4) | 3 (15.8) | 3 (15.8) |
Combination of kidney anomaliesb | 5 | 3 (60.0) | 0 | 2 (40.0) |
Total | 331 | 208 (62.8) | 41 (12.4) | 82 (24.8) |