TTR and AL amyloidosis: Conducting the differential diagnostics of transthyretin (ATTR) cardiac amyloidosis, technetium pyrophosphate scintigraphy was performed in 12 patients, resulting in negative uptake of tracer (Perugini score 0) in all 12 patients, which is in concordance with scintigraphy findings in patients with AL amyloidosis [32,33].