Figure 3From: Ultrasound-guided percutaneous renal biopsy-induced accessory renal artery bleeding in an amyloidosis patientCongo red staining (X400). The arrows point to Congo red positive material deposition in glomerular mesangial areas (A), walls of the renal arteries (B), and the intestine (C). (D) A polarization image of the Congo red stain shows positive material deposition in glomerular mesangial areas (red arrows) and walls of the renal arteries (yellow arrows).Back to article page