TTC21B and kidney disorder: In cases with a final diagnosis of syndromic kidney disease (PAX2, EVA1, SALL1, NPHP1, NPHP3, NPHP4, TTC21B, ANKS6, COL4A5, COL4A4), more details were added to the surveillance program, including ophthalmological, otorhinolaryngological, and psychomotor development evaluations during childhood and adolescence.