X-ray and CT diagnosis of medullary sponge kidney

Abstract

Objective To explore the values of X-ray and CT in the diagnosis of medullary sponge kidney ( MSK ).Methods 9 patients with MSK in our hospital from 2000 to 2010 were included in this study.All the patients received plain film radiography; 6 of whom received intravenous pyrography ( IVP ) and 7 received plain and enhanced CT scans.The appearances of MSK on X-ray and CT were analyzed retrospectively.Results High-density multiple calculus were found on the plain films.IVP was successful on 5 of 6 patients to find dilated collecting ducts as linear or cystiform,fillled with contrast medium,the calculus located ate the renal medullary.Multiple calculus at the renal medullary on CT plain scans in 7 patients,showing dilated collecting ducts as cystiform or linear,the calculus located at the dilated cysts and collecting ducts.After enhancement, the renal collecting duets dilated as linear or cystifonn and filled with contrast medium,and the contrast medium did not exclude on the delayed scans,revealing a of symbol of contrast- urine division.Conlusions Both X-ray and CT scans can accurately detect medullary sponge kidney.But CT is a necessary choice as x-ray failed to make diagnosis.Contrasturine division on CT delayed scans is a special sign for diagnosis. Key words: X-ray; Tomography; Computer; Medullary spongekidney; Diagnosis