Myeloma Kidney : Morphology
Myeloma cast nephropathy in a kidney biopsy. The light chain casts (myelomatous casts) can be distinguished from hyaline casts that may also be present with the help of PAS stain. Myelomatous casts are PAS negative (pale pink - left of image), where as hyaline casts are PAS positive (dark pink - right of image). By Nephron - Own work, CC BY-SA 3.0, Original Source is here.