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contentuptodate· Content· item f32_53_33620
©2013 UpToDate ® Print Email Amyloid goiter: Microscopic section with Congo red stain Microscopic section (Congo red and hematoxylin and eosin stains, magnification x 100) of the thyroid from a patient with an amyloid goiter stained with Congo red shows green birefringence under polarized light microscopy. Note deposition of amyloid material surrounding a thyroid follicule (F) and in the perivascular (V) space. Courtesy of Stephanie L Lee, MD, PhD.