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Arch Neurol. 1975 Aug;32(8):572-4.

Carcinoid myopathy. Serotonin-induced muscle weakness in man?


A myopathy, which improved with cyproheptadine hydrochloride therapy, developed in a patient with carcinoid syndrome of ten years' duration. Biopsy examination revealed advanced atrophy of type II muscle fibers, with type I fiber preponderance. Many of the small fibers had degenerated. Carcinoid myopathy may be due to excess circulating serotonin.

[Indexed for MEDLINE]

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