Two cases of renal filling defects caused by Candida albicans are presented. In each case Candida grew about debris from papillary necrosis. Radiographically the renal pelvis showed changes compatible with chronic renal inflammatory disease, the minor calyces appeared blunted, and radiolucent material was seen in the pelvis and calyces. Urine obtained by catheterization or suprapubic aspiration which contains Candida is diagnostic. The possibility of fungus balls should be considered in the differential diagnosis when radiolucent filling defects are present in the renal pelvis and calyces.