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Photomicrographs of EUS-FNA specimen of GIST. A: Hematoxylin-eosin stain; B: Immunohistochemical stain for c-kit; C: Immunohistochemical stain for CD34; D: Immunohistochemical stain muscle actin; E: Immunohistochemical stain for S-100. The tumor is diffusely positive for c-kit and CD34 and negative for muscle actin and S-100. The immunohistochemical pattern diagnosis is GIST.
