Fig. 4From: The clinicopathological significance of angiogenesis in hindgut neuroendocrine tumors obtained via an endoscopic procedureDifferences in microvessel density in tumors with and with without venous invasion. Legend: The microvessel density values of tumors with venous invasion were significantly higher than for tumors without venous invasion (*, p < 0.001, Mann–Whitney U test; values are expressed as the mean ± standard deviation)Back to article page