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. 2020 Sep 23;21:198. doi: 10.1186/s12875-020-01252-4

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Assessments for noninvasive diagnosis of ATTR amyloidosis. (A-D) ^99mTc-DPD bone tracer scintigraphy. a No uptake outside of bone (score 0) is typical of patients without ATTR amyloidosis. b Some uptake outside of bone without myocardial uptake (score 1) may be seen in AL amyloidosis or possibly ATTR amyloidosis; if suspicion is high, consider a biopsy. c Moderate (score 2, myocardial uptake = rib uptake) and d high (score 3, myocardial uptake > rib uptake) uptake in the heart along with suspicious symptoms is diagnostic for ATTR amyloidosis (serum and urine immunofixation and FLC levels must be normal to discount AL amyloidosis). e, f ^99mTc-PYP bone tracer scintigraphy. e Planar chest and f SPECT chest scans that demonstrate uptake both in blood pool and in the myocardial wall. ^99mTc-DPD, technetium-99 m-3,3-diphosphono-1,2 propanodicarboxylic acid; ^99mTc-PYP, technetium-99 m pyrophosphate; AL, light-chain amyloidosis; ATTR, transthyretin amyloid; FLC, free light chain; SPECT, single photon emission computed tomography. a-d Reused with permission from Perugini E, et al. [60]. e-f Courtesy of Morie Gertz