PMC6581982_01
Abdominal ultrasonography shows the presence of a solid mass in close approximation to the kidney.
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The mass did not involve the abdominal cavity's wall (Fig. 1).
Enhanced CT scan shows a heterogeneously enhancing mass. The latter had mottled calcifications and a cystic portion. It measured 38 mm in length in abdominal cavity (a). T2-weighted MRI showed a low intensity mass separate from the bowel (b).
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A further evaluation by computed tomography showed the presence of a 38 x 25 mm heterogeneously enhancing mass, with mottled calcifications and a cystic portion arising from small bowel mesentery (Fig. 2a). WI) (Fig. 2b). We diagnosed either sarcoma of the mesentery or gastrointestinal stromal tumor.
Intraoperative findings showed the presence of a 38 x 22 mm solid mass in the small bowel mesentery (a). En bloc mass excision with laparoscopic coagulation shears from mesentery (b). The tumor was completely resected (c). The umbilical incision (d).
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It did not involve the stomach, intestine and marginal vessel (Fig. 3).
The resected specimen showed 38 x 25 x 13 mm elastic hard mass (a). Histopathologically, the tumor contained malignant tumor cells with osteoid formation (x100, H&E) (b).
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The focal area showed the presence of more atypical cells with surround osteoid formation (Fig. 4).