Classically, patients present with Dietl's crisis, infections, or kidney stones; however, prenatal assessments aim to identify significant UPJO and prevent deleterious consequences.
Symptomatic patients were those patients who presented with pain (including Dietl's crisis), urinary tract infection, pyelonephritis, stones, renal insufficiency, failure to thrive, abscess, or sepsis.
(1,4) Unfortunately, the other main conclusion of all of these studies is that we are unable to accurately predict which patients will suffer a deterioration in function or develop a complication (urinary tract infection, Dietl's crisis, stone).