[Spontaneous rupture of a simple renal cyst to the pyelocalyceal system. Evolution from Bosniak I to IIF].
OBJECTIVE
To report the spontaneous rupture of a renal cyst into the adjacent pyelocalyceal collecting system.


METHODS
We present the case of a 47 year old woman with a 17 centimeter simple renal cyst (Bosniak I) as well as ipsilateral nephrolithiasis. The patient had a febrile urinary tract infection with flank pain. A subsequent CT scan revealed that this cyst spontaneously ruptured into the renal pelvis.


RESULTS
Follow up evaluations showed the former cyst has decreased in size and contain thick and nodular calcifications. At present it is a Bosniak IIF cyst.


CONCLUSIONS
Simple renal cysts can spontaneously rupture and drain into the adjacent renal collecting system.
Hernández Castrillo
Alberto
A
Servicio de Urología, Hospital Comarcal de Laredo, Laredo, Cantabria, España. a.h.castrillo@telefonica.net
de Diego Rodríguez
Enrique
E
Rado Velázquez
Miguel Angel
MA
Lanzas Prieto
José Manuel
JM
D002114:Calcinosis / Q000000981:diagnostic imaging; D003560:Cysts / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007669:Kidney Calculi / Q000000981:diagnostic imaging; D007670:Kidney Calices / Q000000981:diagnostic imaging*; D052177:Kidney Diseases, Cystic / Q000000981:diagnostic imaging*; D007682:Kidney Pelvis / Q000000981:diagnostic imaging; D008875:Middle Aged; D011859:Radiography; D012422:Rupture, Spontaneous / Q000000981:diagnostic imaging