Sonographic standards for a single functioning kidney in children.
OBJECTIVE
We investigated the sonographic measurements of the functioning kidney of children who were born with a single functioning kidney.


METHODS
In 56 children (0-6 years old) with one multicystic dysplastic kidney and one functioning kidney, the length of the functioning kidney was correlated with the child's age, weight, and body surface area.


RESULTS
The mean length of the kidney was 51.0 mm in children 2 weeks old, 56.8 mm at 9 weeks, 62.8 mm at 23 weeks, 69.6 mm at 46 weeks, 71.7 mm at 63 weeks, 78.0 mm at 112 weeks, 79.6 mm at 172 weeks, 86.7 mm at 225 weeks, and 91.0 mm at 279 weeks. When these results were compared with existing sonographic standards for bilateral functioning kidneys, the single functioning kidneys were longer by a statistically significant amount.


CONCLUSIONS
Compensatory hypertrophy of single functioning kidneys occurs in utero. In children of the ages we investigated, the size of single functioning kidneys exceeded established standards for the size of bilateral functioning kidneys.
Department of Radiology, Hospital for Children NHS Trust, London, United Kingdom.
G T
GT
Rottenberg
R
R
De Bruyn
I
I
Gordon
D000367:Age Factors; D001830:Body Surface Area; D001835:Body Weight; D002648:Child; D002675:Child, Preschool; D005500:Follow-Up Studies; D006801:Humans; D006984:Hypertrophy; D007223:Infant; D007231:Infant, Newborn; D007668:Kidney / Q000000981:diagnostic imaging* / Q000254:growth & development / Q000473:pathology / Q000502:physiology; D007690:Polycystic Kidney Diseases / Q000000981:diagnostic imaging*; D012189:Retrospective Studies; D014463:Ultrasonography