Bilateral obstructing ureteric calculi in pregnancy: a rare cause of acute renal failure. 
Bilateral obstructing ureteric calculi is a rare cause of acute renal failure.  Although urolithiasis in later pregnancy is not uncommon, the development of bilateral obstruction secondary to ureteric calculi in the first trimester is rare and poses difficulty to diagnosis and management.  Symptoms of diseases and physiological changes associated with pregnancy can obscure diagnosis of urolithiasis and obstructive uropathy.  Advances in minimally invasive endourology afford intervention with reduced risk to fetal health.  We present the second case of acute renal failure caused by bilateral obstructing ureteric calculi in a pregnant patient and discuss current management algorithms for this group.