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Table 1 Factors predicting malignant behavior (8, 11)

From: Paraneoplastic brainstem encephalitis in a patient with exceptionally long course of a metastasized neuroendocrine rectum neoplasm

Predictive factor

 

Tumor size

> than 20 mm

Mitotic index

>2/10 high power fields

Muscularis layer invasion

--

Lymphovascular invasion

--