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Pseudoangiomatous Stromal Hyperplasia of Breast

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Pseudoangiomatous stromal hyperplasia (PASH) is a myofibroblastic tumor which may mimic angiosarcoma. Most women with PASH are premenopausal. It is also seen frequently in the setting of gynecomastia. The main histologic feature is an anastomosing pattern of slit-like spaces in the interlobular and intralobular stroma.

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