RT Journal Article SR Electronic T1 Unique association of multiple endocrine neoplasia 2A and congenital anomalies of the kidney and urinary tract in a child with a RET mutation JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e229904 DO 10.1136/bcr-2019-229904 VO 12 IS 8 A1 Olivia R Wood A1 Tobias Else A1 Matthew G Sampson YR 2019 UL http://casereports.bmj.com/content/12/8/e229904.abstract AB Pathogenic variants in the RET gene can cause isolated and multi-system diseases. We report a patient diagnosed prenatally with unilateral multicystic dysplastic kidney and genitourinary abnormality whose mother had multiple endocrine neoplasia type 2A (MEN2A). Targeted RET sequencing found the same pathogenic variant p.C618S in the child as her mother. The child is followed by paediatric nephrology for congenital anomalies of the kidney and urinary tract (CAKUT) and by endocrine oncology for surveillance for MEN2A-related endocrine tumours. While implicated in each of these conditions individually, RET variants have never been reported to cause MEN2A and CAKUT together. This child’s family history prompted RET sequencing, resulting in presymptomatic, personalised care for MEN2A. However, this case supports the idea that genetic screening of RET (and many other genes) in patients with CAKUT may lead to molecular diagnoses that potentially improve their health through precision care.