Background/aims: This study presents an analysis of the sonographic and laboratory parameters of solitary kidney in Wilms tumour survivors (TWs) and compares these parameters with those of healthy individuals.
Methods: Fifty-three TWs who completed treatment for Wilms tumour and 44 healthy individuals were enrolled. The study protocol consisted of completing a medical history, sonographic examination of the solitary kidney, estimation of glomerular filtration rate (eGFR) by the Schwartz or MDRD formulas, albumin urine excretion and BP measurement.
Results: Sonographic signs of kidney damage were observed in 22 (41,5%) TWs. The most frequently detected abnormalities are hyperechoic rings around renal pyramids (28,3% TWs). Hypertrophy of the solitary kidney occurred in 71,7% of cases. The mean volume of the solitary kidney was 77% of the sum of the two kidney volumes in the control group. The median eGFR in the TWs group was 117 with 25Q-105,5, 75Q-130 ml/min/1,73 m2 vs 131,8 with 25Q-124, 75Q-140 ml/min/1,73 m2 in the control group (p=0,000). Six TWs (11,3%) had a value of eGFR below 90 ml/min/1,73 m2. Increased urine albumin excretion (> 30 mg/g) was observed in 7 TWs (13,2%) and in 3 (6,8%) individuals in the control group.
Conclusion: Ultrasonographic abnormalities in solitary kidney of TWs are frequent. The most frequently detected abnormalities are hyperechoic rings around renal pyramids. Sonographic examination of TWs ought to be performed not only to detect tumour recurrence but also to assess the signs of kidney damage and their progression.
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