Unusual presentation of Wilson's disease as proximal renal tubular acidosis with isolated phosphaturia.

An adolescent girl presented with recurrent lower limb fractures and was managed as osteogenesis imperfecta. Low phosphate levels noted on routine investigation were the clue for the phosphaturia and subsequent diagnosis of proximal renal tubular acidosis (RTA). Further, with a history of jaundice, she was diagnosed with Wilson's disease, which was the underlying cause of proximal RTA with isolated phosphaturia and consequent fractures.