Fetal renal pelvic dilation occurs in 1% to 5% of all pregnancies. Although most are benign, it can be associated with genetic and structural disorders. Are you familiar with the CAKUT syndrome? When should Chromosomal MicroArray Analysis (CMA) be offered? What about prognosis? In the session, we will summarize and highlight the main points of the SMFM consult series #4 covering fetal renal pelvis dilation.