04 July 2022
: Case report 
Acute Mitral Regurgitation Due to Chordae Tendineae Rupture: A Rare Presentation of Cardiac Amyloidosis
Unusual clinical course, Challenging differential diagnosis, Rare disease
Regina Aguilar-López1ABCDEF, Cristopher Cándido Sánchez-Rodríguez2ABCDEF, Daniel Manzur-Sandoval2ABCDEF, María Flores Calvo1ABCDEF, Alberto Aranda-Fraustro3ABCDEF, Antonio Jordán-Ríos4ABCDEF, Alejandro Francisco-Cruz3ABCDEF, Gustavo Rojas-Velasco2ABCDEF*DOI: 10.12659/AJCR.936545
Am J Case Rep 2022; 23:e936545
Figure 6. Native mitral valve showing Congo red positive deposits. (A) Subendocardial and spongiosa stroma with mild thickening (black arrowhead) (hematoxylin and eosin ×250). (B, C) Laminar and linear positive staining pattern in the subendothelial stroma (black arrowheads) (Congo red and crystal violet, ×100 and ×250]. (D) Granular calcium pattern in the cytoplasm of endothelial and stromal cells (black arrowhead) (Von Kossa; ×100 and ×250).