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Cardiac 123I-metaiodobenzylguanidine (MIBG) scintigraphy performed 10 months after the symptom onset. 1) Heart and 2) mediastinum. Early- (A) and late-phase (B) MIBG scans show a decreased heart-to-mediastinum ratio (early phase 1.65; late phase 1.53) (institutional cut-off value, 2.0).
