The Carcinoid Tumour

a carcinoid of the ileum, and remarked that the occurrence of a carcinoid with another type of malignant tumour was very rare. The fact that, among 600 autopsies during 1947, we had two examples of carcinoid in multiple tumour complexes made us doubt this statement and decide to investigate the carcinoid tumour further. We soon realised that the significance of the term " carcinoid " had altered since its introduction (Obendorffer, 1907). The purpose of this paper, therefore, is to estimate the malignancy of the tumour and to discuss its nomenclature and occurrence as part of a multiple tumour complex. It will be necessary, in doing so, to refer briefly to the pathogenesis of the tumour.