Diagnosis
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• Only 1 of these criteria (if 2, atypical leiomyoma; if 3, leiomyosarcoma): 5 cm+, infiltrative markers, 5+ mitotic figures/10 HPF, moderate/severe cytologic atypia (Am J Surg Pathol 1996;20:779)

Treatment
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• Conservative excision with long-term, careful follow up

Positive stains
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• ER, PR

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