Oral and Lower Extremity Ulcers as the Initial Presentation of Granulomatosis with Polyangiitis

Figure 4

This section is stained for fibrinogen and kappa and lambda light chains. There is focal and segmental staining of glomeruli with fibrinogen, in areas of crescents/fibrinoid necrosis (arrow). Kappa and lambda stain equally throughout the tubulointerstitium.