what do hyaline casts in urine mean
1 (Hyaline cast) Urinary casts are cylindrical structures produced by the kidney and present in the urine in certain disease states.2  They form in the distal convoluted tubule and collecting ducts of nephrons, then dislodge and pass into the urine, where they can be detected by microscopy. (Hyaline cast) Urinary casts are cylindrical structures produced by the kidney and present in the urine in certain disease states.