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Histologic examination of sural nerve of a 32-year-old man with an aggressive polyneuropathy associated with autonomic failure demonstrated amyloid deposition, and familial amyloidotic polyneuropathy (FAP) was diagnosed. Immunohistochemical staining showed transthyretin (TTR) staining of the amyloid deposits in nerve. Sequencing revealed G to A transition in the codon 54 causing TTR Lys 54. This is a new variant TTR associated with aggressive FAP.

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Hypermetabolism is common in patients with DLB and may be related to visual hallucinations.