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Yolk Sac Tumor : Polyvesicular Vitelline

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Yolk sac tumor (YST) of the testis shows a variety of architectural patterns that are admixed in varying proportions.

Polyvesicular vitelline: This uncommon pattern shows vesicles lined by flattened bland tumor cells surrounded by loose myxoid or fibrous stroma. Some of the vesicles have constriction creating a dumbbell or figure of 8 appearance. The epithelium is AFP positive. The vesicles may contain hyaline globules.

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