Editing Urinary Tract Infections (section)

===== Diagnosis and Evaluation =====
* '''The onset of symptoms is typically insidious. Symptoms are present for > 5 days in most patients'''
* Perinephric abscess should be suspected in a patient with UTI and abdominal or flank mass or persistent fever after 4 days of antimicrobial therapy.
* '''Factors that differentiate perinephric abscess and acute pyelonephritis (2):'''
*# '''Most patients with uncomplicated pyelonephritis are symptomatic for < 5 days before hospitalization, whereas most with perinephric abscesses are symptomatic for > 5 days'''
*# No patient with acute pyelonephritis remained febrile for longer than 4 days once appropriate antimicrobial agents were started. All patients with perinephric abscesses had a fever for at least 5 days, with a median of 7 days.