Renal candidiasis of the infant: ultrasound evaluation.

Sonographic diagnosis of 3 cases of renal candidiasis led to early diagnosis and treatment. Echogenic densities within a dilated pyelocalyceal system appeared to be the classic finding for obstructing candidal bezoars or candidal pyonephrosis in the premature neonate. Sonography was useful in guiding diagnostic and therapeutic percutaneous nephrostomies of very premature (900 and 750 g) infants. The ultrasonic findings of moderate echogenicity within dilated collecting systems in premature infants suggest pyonephrosis. Candidiasis should be considered as a prime cause.