Ma et al reported equations for depth of a horseshoe kidney from the back. The authors are from Chinese PLA General Hospital in Beijing.
Patient selection: horseshoe kidney, adult from 19 to 92 years of age
Parameters:
(1) body weight in kilograms
(2) total body thickness at the level of the kidneys in cm
(3) age in years
right renal depth in cm =
= (0.273 * (thickness)) + (0.043 * (weight)) + 1.086
left renal depth in cm =
= (0.245 * (thickness)) + (0.041 * (weight)) + 0.676
isthmus depth in cm =
= (soft tissue depth in cm) + (vertebral depth in cm)
soft tissue depth in cm =
= (0.144 * (thickness)) + (0.044 * (weight)) + 0.536
vertebral depth in cm =
= (0.012 * (age)) + (0.018 * (weight)) + 3.683
