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Yolk Sac Tumor : Microcystic Pattern

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Small cystic spaces lined by flattened endothelium-like or cuboidal cells. Immunohistochemically, yolk sac tumors show diffuse granular positivity for AFP and keratin. A combination of SALL4 positivity and OCT3/4 negativity is considered to be highly specific for yolk sac tumor. GATA-4, a transcription factor, is expressed in pediatric cases.

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