<s>[INST] hi my wife is 20weeks pregnant and today she had undergone ultra sound scan with doppler in the report they mentioned left kidney shows prominent partly extra renal pelvis measuring 3mm anteroposteriorly, otherwise both fetal kidneys show normal echotexture with no significat pelvicalyceal system dilatation what does it mean [/INST] Hello and welcome to ChatDoctorThe ultrasound report comments on the kidneys. One of the kidney has an extrarenal pelvis. A kidney is involved in the formation OD urine. The urine is formed and enters the urine tube called ureter. A ureter is dilated to form a receptacle called pelvis. Normally, the pelvis is present inside the borders of the kidney. In some cases the pelvis is large and is extends outside the kidney. This is called extrarenal pelvis. It is just a structural anomaly and does not any effect on the function of the kidney. However, due to large size there may be urine stasis or reflex of urine. This reflux causes recurrent UTI. So, there is no antenatal risk in your wife or baby. However, after birth up to 10 years of life recurrent UTI may occur depending on the severity of the structural abnormality. Micturating cartography and DMS scan may be required but only after consultation with pediatrician. Thank you and take care Chat Doctor.  </s>