All are TRUE about foregut carcinoid tumors, EXCEPT:
Foregut carcinoid tumors generally have a low serotonin content. They are argentaffin-negative but argyrophilic and occasionally secrete adrenocoicotropic hormone or 5-hydroxytryptophan, causing an atypical carcinoid syndrome. They are often multi hormonal and metastasize to bone. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 3058.
Foregut tumors generally have a low serotonin content
Argentaffin-negative but argyrophilic
Often multi hormonal
Bone metastasis in not a feature