14-year-old boy has been diagnosed with nephrotic syndrome. 5days later he presents with flank pain, hem urea levels. A diagnosis of renal vein thrombosis is made.
What is the most likely cause for renal vein thrombo?
A . Loss of anithrombin III
B . Stasis
C . Protein C deficiency
D . High estrogen levels
E . Vasculitis
Answer: A