PMC5410474_01
Plain computed tomography (a) demonstrated a low-density tumor of 22 mm in diameter, in the small intestine. The gradual retention of contrast agent was observed in the dorsal area of the tumor from the arterial phase (b) to equilibrium phase (c).
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No meandering or dilated vessels were seen around the tumor (Fig. 1).
Double-balloon enteroscopy showed a submucosal tumor of approximately 20 mm in diameter in the jejunum. A depression attached to the clot is shown at the top of the tumor.
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A depression attached to a clot was observed on the top of the tumor (Fig. 2).
Gastrografin fluoroscopy showed a mass with a smooth margin forming obtuse angles with the jejunal wall.
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The tumor appeared to be localized to the submucosa on gastrografin (Schering, Berlin, Germany) fluoroscopy (Fig. 3).
Abdominal ultrasonography showed a well-circumscribed, round tumor in the small intestine, arising in the third and fourth layers of the intestinal wall.
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The internal echogenicity of the tumor was almost anechoic, but part of the tumor was hyperechoic (Fig. 4).
A macroscopic examination revealed a unilocular, cystic lesion, measuring 18x15x10 mm in size and containing a clot. An ostium was apparent on the mucosal surface.
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Treitz and measuring 18x15x10 mm. The tumor showed a unilocular cystic lesion, which contained a clot inside, with an ostium on the mucosal surface (Fig. 5).
A histological examination (a, b) showed a cystic lesion extending from the submucosa to the muscularis propria. A blood clot was present inside, with a laceration of the muscularis mucosa and the mucosal layer at the top. An immunohistochemical examination showed that the cells covering the surface of the cystic lesion were positive for factor VIII (c) and that the wall was positive for HHF35 (d).
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A histological examination (Fig. 6a and b) revealed a cystic lesion extending from the submucosa to the muscularis propria. An immunohistochemical examination (Fig. 6c and d) revealed that the flat cells on the luminal surface of the cystic lesion were positive for factor VIII and CD34 and negative for D2-40 and keratin, indicating vascular endothelial cells.