(A) Haematoxylin and eosin 2×. Tissue on the left (black arrow) showing normal myocardial muscle with pale, pink deposits within vessels and infiltration into the tissue on the right (blue arrow). (B) Congo red 2×. Congo red staining positive in the amyloid deposits. (C) Haematoxylin and eosin 40×. Pale-pink, glassy extracellular material present. No plasma cells identified. (D) Congo red 40×. Strong Congo red staining identified, confirming the diagnosis of amyloidosis.