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Pleomorphic Adenoma

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Pleomorphic adenomas (PA) have epithelial, myoepithelial and stromal components and the histopathologic appearance of a classic PA can be variable depending upon the relative proportion of these elements. This low power view of a PA shows a well-demarcated tumor with a lobulated growth pattern. The tubular and acinar structures formed by the epithelial component are admixed with myoepithelial cells in a background of myxoid stroma.

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