NCIt synonyms : Carcinoid Tumor of the Lung; Pulmonary Carcinoid Tumor; Carcinoid Tumor of Lung; Lung NET; Lung Carcinoid Tumor;
NCIt definition : A well-differentiated neuroendocrine neoplasm that arises from the lung. It is characterized
by the presence of uniform polygonal cells with small or moderate amount of cytoplasm
and inconspicuous nucleoli. The cells are usually arranged in organoid and trabecular
patterns. It is classified as grade 1 (G1-typical carcinoid tumor) or grade 2 (G2-atypical
carcinoid tumor) based on the number of mitotic figures and the absence or presence
of necrosis. Grade 2 neuroendocrine tumors have a worse prognosis.;