PMC5257185_01
A. A contrast-enhanced CT image shows a tumor lesion (arrow) with partial contrast enhancement and calcification of the lesion edge in the mesentery. The size of the tumor lesion is 15 mm. B. An US image shows a well-defined hypoechoic, homogeneous tumor lesion in the small intestine near the tumor mass in the mesentery. The size of the tumor lesion is 15 x 9 mm. C. A color Doppler image shows hypervascularity within the tumor. D. A CT image shows a tumor lesion with weak contrast enhancement in the small intestine near the tumor lesion in the mesentery (arrows).
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The lesion showed partial contrast enhancement and calcification of the lesion edge (Fig. 1A). The US revealed a well-defined hypoechoic, homogeneous oval (15 x 9 mm) tumor lesion in the small intestine near the tumor lesion in the mesentery (Fig. 1B). Color Doppler examination showed hypervascularity within the tumor (Fig. 1C). Re-evaluation of the CT images revealed a tumor lesion with weak contrast enhancement in the small intestine near the tumor lesion in the mesentery (Fig. 1D).
A. A surgical specimen of the small intestine shows a polypoid tumor. The size of the tumor is 15 mm. B. Hematoxylin and eosin (HE) staining of the small-intestine tumor (x12.5). C. HE staining of the small-intestine tumor (x200). D. Chromogranin A staining of the small-intestine tumor (x200). E. Ki-67 staining of the small-intestine tumor (x200).
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Laparotomy revealed only one small-intestine tumor (15 mm in size) and one enlarged lymph node in the small-intestine mesentery (Fig. 2A). A staining of the specimens was positive, and the positive rate of Ki-67 staining was less than 2% (Fig. 2D, E). According to the Ki-67 labeling index and the 2010 WHO classification, the histologic classification of the tumor was an NET Grade 1.