Question category: Nephrology
A 3 year old is brought to the GP as she is thought to be drinking and urinating excessively by her parents. She has recently began wetting the bed again after being potty trained last year. She appears very small for her age. Bloods reveal renal impairment, urinalysis normal and an ultrasound is organised. On ultrasound the kidneys appear small and there is evidence of multiple small medullary cysts. What is the most likely diagnosis?