Diagnosis and Prognostic Significance of Extramural Venous Invasion in Neuroendocrine Tumors of the Small Intestine

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Extramural venous invasion (EMVI) is an established independent prognostic factor in colorectal carcinoma where it is linked to hematogenous spread (i.e., liver metastases), influencing the decision for adjuvant chemotherapy. However, its prognostic significance in small intestinal neuroendocrine tumors (NETs) has not been studied, nor is it routinely assessed or reported. We reviewed primary small bowel NETs (14 jejunum, 82 ileum, 8 not specified) from 104 patients (52 women; median age 60.5, range: 24–84). EMVI was identified in 58 cases (55.8%), including in 13 of 21 equivocal cases using an elastin stain. In univariate analysis, EMVI was associated with lymphovascular and perineural invasion, tumor stage, and lymph node and distant metastases, whereas in multivariate analysis, only distant metastases remained significant (p < 0.001). Liver metastases were... Read more at the Modern Pathology Blog.

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