HNF1B and Renal cortical cysts: A maternally transmitted canonical splice variant c.809 + 1G>A in HNF1B was identified in case 16 with bilateral renal cortical cysts after birth, while the same mutation inherited from the father was also reported in a previous study, in which the fetus was born with a unilateral ureteropelvic junction and renal failure, apart from bilateral renal cortical cysts (Heidet et al., 2010).