Fig. 1

Nonfilamentous and filamentous types of atrial amyloid. Nonfilamentous amyloid exhibits a homogenous and dense staining pattern on both (a) hematoxylin & eosin and (c) sulfated Alcian blue staining; whereas filamentous amyloid appears more thread-like and darkly staining on (b) hematoxylin & eosin and (d) sulfated Alcian blue staining (original magnification, ×200)