Patient: Hello, Dr. Geng, I found the fetus right hydronephrosis 1.4 at 37 weeks of pregnancy, and now I went to the Children’s Hospital after the first month to check the right hydronephrosis 1.6, ultrasound results: the size and shape of both kidneys are normal, the right kidney sinus echogenic separation 1.6cm. The ureters were not dilated bilaterally. I would like to ask Dr. Geng, what should be the next step of treatment for my baby’s condition, as MRI is not good for babies? Expert: From the information you provided, no indication for surgery was found. On the contrary, if we look at the ultrasound results and the course of the disease alone, it is very likely that this type of hydronephrosis will recover on its own or maintain its current condition. What you need to do now is an isotope test to understand the current renal function, which will be beneficial for future follow up. According to my habit, most of the hydrocele detected in the fetal period only need ultrasound and isotope to fully understand the condition of the child, only a small percentage of children need MRU or CTU to further clarify the diagnosis. Patient: Thank you, Dr. Geng, for your patient response. I feel better after hearing your diagnosis.