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Three postmenopausal women were found to have abnormal Pap smears attributable to cells derived from mesonephric remnants or mesonephric hyperplasia of the cervix (one patient) or the upper vagina (two posthysterectomy patients). Mesonephric remnants or hyperplasia may represent the sole cause of abnormal Pap smears.
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Welsh et al. (2003) studied this question.
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