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Subepithelial lesions. A: Endoscopic ultrasound-fine needle tissue acquisition of a subepithelial lesion using a 19 gauge needle; B, C: Histological examination showed large fragments of neoplastic tissue with solid structure, composed of regular, fused cells with mild atypia, which were intensively immunoreactivity for c-Kit, consistent with gastrointestinal stromal tumor.
