<s>[INST] My 9 yr old daughter had a brain bleed in Oct. 2012. All neuro scans came back fine. No AVM s or problems with vessels. No cause determined. Recently we found that she only has one kidney . Scans show no vessels connected to the small renal mass on her left side. Could having one kidney still be a cause for the brain bleed. High blood pressure was also ruled out. [/INST] Hi, There is one condition that rings a bell in that it has both renal and brain manifestations. It also causes you to have bleeds in both organs. This is AR PKD. This is known as autosomal recessive polycystic kidney disease. This disease causes the person to sometimes develop cysts in the brain that may bleed in rare cases. This is one common scenario I can think of. There might be more. But for that I need a more complete history. Feel free to contact me again. Chat Doctor.  </s>