Key words: neuroendocrine tumor, morphological factors of prognosis, electronic and microscopic investigation, immunohistochemical investigation.
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The morphological, electronic and microscopic and immunohistochemical investigation data of 135 abdominal cavity and retroperitoneal space organ neuroendocrine tumors is presented. It is demonstrated, that a low degree of a tumor differentiation, an expressed discomplexation, a cellular and nuclear polymorphism and metastases in the regional lymph nodes are the more informative morphological factors of a disease flow unfavorable prognosis. A ratio of differentiated and non-differentiated cells in a tumor is a more informative ultrastructural sign in a prognosis. An immunohistochemical investigation is obligatory for the given type of tumors.