Abstract
A malignant carcinoid of the small intestine, presenting the syndrome described by Thorson and coll. : argentaffine tumour of the intestine, variable cutaneous erythema and cyanosis, valvular heart disease acquired in some cases. It is now demonstrated that these tumours are secreting 5 hydroxytryptamine, 5-HT, also called Enteramine or Serotonin, cause of the symptomatology.

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