Fig. 3
From: A case of bilateral amyloidosis localized to extraocular muscles mimicking thyroid eye disease
Histopathological examination of the right medial rectus muscle: (A) Hematoxylin and eosin staining at ×200 magnification, revealing widespread eosinophilic amorphous material amidst atrophied muscle fibers (B) Direct fast scarlet stain at ×200 magnification, indicating positive staining of the eosinophilic material (C) Polarized light microscopy showing apple-green birefringence of the material