[Focal bacterial nephritis: diagnosis and treatment]

Focal bacterial nephritis or lobar nephronia represents an acute localized non-liquefactive infection of the kidney caused by bacterial infection. This is an uncommon form of pyelonephritis that can affect both adults and children. Imaging techniques, particularly CT scan, are necessary for diagnosis and to distinguish it from other conditions (abscess or renal masses) that require a different treatment. The authors describe a case of acute lobar nephronia in a 24-year-old man.