[Morphologic substrate in bacterial urinary tract infections (author's transl)].

Bacterial urinary tract infections can lead to acute or chronic, nonspecific or specific lesions of the kidney, renal pelvis, ureter, urinary bladder, and urethra. The inflammatory process may be limited to the kidney and/or to segments of the urinary tract. The most important and frequent pathoanatomic alterations were defined; the microscopic findings were described and supplemented with selected macroscopic and pathogenetic aspects. Juvenile bacterial interstitial nephritis was differentiated from adult bacterial interstitial nephritis on the basis of age-dependent anatomic conditions.