The biochemical and ultrastructural findings in 6 patients affected by bronchial carcinoid formed the basis of this study of the relationship between the morphology and the function of this tumor. The following conclusions are drawn: 1) the «secretion granules » observed under the electron microscope vary in number according to the cell age of the tumor; 2) it is confirmed that the diagnosis of bronchial carcinoid is based on the histological data obtained under the light microscope and in some cases may be confirmed either by electron microscope or biochemical studies; 3) the morphofunctional study of the tumor should allow classification of the different stages of bronchial carcinoid.
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