Pomolidomide for relapsed/refractory light chain amyloidosis after resistance to both bortezomib and daratumumab: A case report

Figure 1 Endomyocardial biopsy. A: Light microscopy showed amyloid deposits-stained pink to red by Congo red; B: The amyloid showed an apple-green birefringence under polarized light; C: Monoclonal lambda light chains were visualized by immunohistochemistry; D: Electron microscopy showed an 8-12 nm wide fibrillar appearance (400 ×). The red arrow indicates protein colloids in the amyloid fiber.