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Gastrointestinal Stromal Tumor

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The patient was a 59 y/o male who presented with an abdominal mass and was found to have a 7.0 cm mass in his ileum. The resected specimen showed a well-circumscribed mass without hemorrhage or necrosis. The tumor consists of relatively bland cells arranged in short intersecting fascicles. Immunohistochemical stains for CD117 and SMA were strongly positive, where as S-100 was negative.

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