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Table 1 Distribution of kidney anomalies in 331 fetuses

From: Is an analysis of copy number variants necessary for various types of kidney ultrasound anomalies in 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)
  1. aIncluding renal agenesis, renal dysplasia, multicystic dysplastic kidney, cystic kidney or polycystic kidney
  2. bPresence of at least two types of the kidney anomalies described above
  3. cIncluding fetuses with extrarenal structural anomalies, fetal growth restriction, hydrops fetalis or abnormal amniotic fluid volume