A seven year old asymptomatic girl is found to have persistant hypeension. There is no significant history and urine examination is normal. Which of the following is the most likely cause?

Hypeension in children is mostly associated with renal diseases. As far as other options are concerned, essential hypeension is uncommon in children (5-10%). Persistent hypeension is an uncommon presentation of coarctation of aoa and children with polycystic kidney disease present with bilateral abdominal mass and they may also have hypeension and impaired urinary concentrating ability. Ref: Essential of Pediatrics By O P Ghai, 6TH Edition, Page 433; Harrison's Principles of Internal Medicin, 16th Edition, Page 1696