situa-se entre 25% a 60% e, alem da informacao do agente etiologico (nem sempre identificavel na urocultura), indica para o risco de uma sepse, sugerindo uma potencial gravidade7(D).5. Exames de imagem. A ultra-sonografia, a tomografia computadorizada e a ressonancia magnetica tem indicacao restrita aqueles casos de cistite/pielonefrite nao resolvidos com terapia empirica; assumem maior importancia para o diagnostico de complicacoes e, tambem, para evidenciar alteracoes estruturais e/ou funcionais do sistema urinario23(C)24,25 (D).Referencias1. Stamm WE, Hooton TM. Management of urinary tract infections in adults. N Engl J Med 1993;329:1328-34.2. Warren JW, Abrutyn E, Hebel JR, Johnson JR, Schaeffer AJ, Stamm WE. Guidelines for antimicrobial treatment of uncomplicated acute bacterial cystitis and acute pyelonephritis in women. Infectious Diseases Society of America (IDSA). Clin Infect Dis 1999;29:745-58.3. Valiquette L. Urinary tract infections in women. Can J Urol 2001;8:6-12.4. Hooton TM. Pathogenesis of urinary tract infections: an update. J Antimicrob Chemother 2000;46:1-7.5. Le Saux N, Pham B, Moher D. Evaluating the benefits of antimicrobial prophylaxis to prevent urinary tract infections in children: a systematic review. CMAJ 2000;163:523-9.6. Zmyslowska A, Kozlowski J, Zielinska E, Bodalski J. Urinary tract infections in children under three years of age. Pol Merkuriusz Lek 2003;14:319-21.7. Hooton TM, Stamm WE. Diagnosis and treatment of uncomplicated urinary tract infection. Infect Dis Clin North Am 1997;11:551-81.8. Naber KG. Treatment options for acute uncomplicated cystitis in adults. J Antimicrob Chemother 2000; 46:23-7.9. Ronald AR, Harding GK. Complicated urinary tract infections. Infect Dis Clin North Am 1997; 11:583-92.10. Fihn SD. Clinical practice. Acute uncomplicated urinary tract infection in women. N Engl J Med 2003; 349:259-66.11. Stamm WE, Norrby SR. Urinary tract infections: disease panorama and challenges. J Infect Dis 2001; 183:(Suppl 1): S1-4.12. Warren JW. Catheter-associated urinary tract infections. Infect Dis Clin North Am 1997; 11:609-22.13. Pewitt EB, Schaeffer AJ. Urinary tract infection in urology, including acute and chronic prostatitis. Infect Dis Clin North Am 1997; 11:623-46.14. Barnes RC, Daifuku R, Roddy RE, Stamm WE. Urinary-tract infection in sexually active homosexual men. Lancet 1986; 1:171-3.15. Spach DH, Stapleton AE, Stamm WE. Lack of circumcision increases the risk of urinary tract infection in young men. JAMA 1992; 267:679-81.16. Pinho AM, Lopes GS, Ramos-Filho CF, Santos O da R, Oliveira MP, Halpern M, et al. Urinary tract infection in men with AIDS. Genitourin Med 1994; 70:30-4.17. Bishara J, Leibovici L, Huminer D, Drucker M, Samra Z, Konisberger H, et al. Five-year prospective study of bacteraemic urinary tract infection in a single institution. Eur J Clin Microbiol Infect Dis 1997; 16:563-7.18. Gupta K, Hooton TM, Stamm WE. Increasing antimicrobial resistance and the management of uncomplicated community-acquired urinary tract infections. Ann Intern Med 2001; 135:41-50.19. Carton JA, Gomez Moro MB, Gonzalez Lopez B, Maradona JA, de Diego I, et al. Nosocomially acquired infection of the urinary tract. Enferm Infecc Microbiol Clin 1989; 7:408-14.20. Orenstein R, Wong ES. Urinary tract infections in adults. Am Fam Physician 1999; 59:1225-34.21. Nicolle LE. Asymptomatic bacteriuria in the elderly. Infect Dis Clin North Am 1997; 11:647-62.22. Mohammad M, Mahdy ZA, Omar J, Maan N, Jamil MA. Laboratory aspects of asymptomatic bacteriuria in pregnancy. Southeast Asian J