Which cast, often found in urine, may appear in normal, healthy individuals?

Hyaline casts are generally considered to be a normal finding in the urine of healthy individuals. They are comprised mainly of protein and can form in the renal tubules due to the concentration of urine and the presence of proteins. While their presence may indicate some degree of proteinuria, small quantities of hyaline casts can be observed in normal urines, especially after vigorous exercise or dehydration.

Other types of casts, such as granular, waxy, and red blood cell casts, typically indicate underlying pathological conditions. Granular casts are often associated with renal parenchymal disease, waxy casts suggest chronic kidney disease, and red blood cell casts indicate glomerular bleeding or damage. Thus, the presence of hyaline casts in urine does not necessarily signify disease, making them the correct answer as they can indeed be found in healthy individuals.