Acute focal pyelonephritis (lobar nephronia) complicating pregnancy.

Lobar nephronia, although initially indistinguishable from acute pyelonephritis, is characterized by a prolonged febrile course. The diagnosis is established radiographically using computed tomography. Treatment involves continuation of antimicrobials until the patient has been afebrile for 48 hours. Lobar nephronia has not been previously reported with pregnancy.