Prediction of the lymphatic, microvascular, and perineural invasion of pancreatic neuroendocrine tumors using preoperative magnetic resonance imaging

Figure 2 A 52-year-old woman with pancreatic neuroendocrine tumor grade 1 underwent magnetic resonance imaging. A-C: Magnetic resonance imaging (MRI) images revealed the regular tumor characteristics on T2-weighted imaging (A), diffusion-weighted imaging (B) and arterial phase (C) of contrast enhanced images. A round, well demarcated tumor with smooth contours is shown on MRIs (white arrow). The tumor pancreas interface is clear; D and E: Hematoxylin-eosin staining (× 400) reveal that the space between the vascular and nerve (black arrow) and the tumor (black arrow) is clear.