PMC3566469_01
Computed tomography scan shows well-defined and complex density mass in mesentery or adjacent proximal jejunum.
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F1
Computed tomography (CT) scan demonstrated an 8.2 x 7.3 cm sized well-defined mass with complex density located in the mesentery or adjacent proximal jejunum (Fig. 1).
Well-capsulated mass originated near the ligament of Treitz.
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F2
At laparotomy, a well-encapsulated mass was found to be arising from the small bowel mesentery near the ligament of Treitz (Fig. 2).
(A) Cells composing tumor are arranged in trabecular pattern and well encapsulated (H&E, x40). (B) Cellular nucleus has coarsely granular chromatin pattern without mitosis (H&E, x400).
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F3
There was no mitosis (Fig. 3A, B).
Tumor expresses strong positivity in immunohisochemical stain with synaptophysin (A), CD56 (B), and cytokeratin (C) (x200).
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F4
Immunohistochemistry showed the tumor to be positive for multiple neuroendocrine markers including synaptophysin (Fig. 4A), CD56 (Fig. 4B), cytokeratin (Fig. 4C).