Diaphragmatic Amyloidosis Causing Respiratory Failure: A Case Report and Review of Literature

Figure 2

Diaphragmatic amyloidosis. (A) Congo red stain of diaphragm showing diffuse positive staining (red-orange) of amorphous extracellular material, 200x. (B) Congo red stain of diaphragm showing apple-green birefringence under polarized light, 200x. (C) Kappa light chain immunostain of diaphragm showing diffuse positivity, diagnostic of kappa amyloid light chain amyloidosis, 20x. (D) Negative lambda light chain immunostain of diaphragm, 20x.