TTR and chronic inflammatory demyelinating polyradiculoneuropathy: Staining a tissue biopsy (salivary gland, abdominal fat, or nerve tissue), typing for amyloid, and screening for TTR mutations by TTR gene sequencing are important measures for identifying amyloid neuropathy in sporadic cases presenting with rapidly idiopathic progressive axonal polyneuropathy of undetermined origin or atypical CIDP [13].