Infection and rupture of a serous renal cyst

: The authors report two cases of acute infection of a renal cyst with rupture into the urinary tract. The diagnosis was made by excretory urograms and ultrasonography. Differentiating a ruptured cyst from congenital caliceal diverticulum may sometimes be difficult. Antimicrobial treatment can control the infection and exclusion of the cyst was obtained in one case. The mechanism responsible for infection and rupture of the cyst are discussed, as well as the management of such cases.