Objective: A malignant mixed müllerian tumor (MMMT) is a high-grade neoplasm commonly arising from the uterus. Patients present with bleeding and a mass protruding from the cervix. This study was designed to correlate Papanicolaou (Pap) smear findings with histological findings in women diagnosed with MMMT. Study Design: Women diagnosed with MMMT were identified. Preoperative Pap tests were correlated with histological findings. Statistical analysis was performed to assess associations between abnormal Pap tests and histological findings. Results: Forty patients with MMMT were included in the study. Age ranged from 37-85 years and tumor size ranged from 1.2 to 21 cm. In presurgical Pap tests (4 conventional and 36 liquid based), 11 smears (27.5%) were diagnosed as negative, 5 (12.5%) as atypical squamous cells of undetermined significance, 6 (15%) as atypical glandular cells, 16 (40%) as malignant and 2 (5%) as high-grade squamous intraepithelial lesion. Malignant cells detected on Pap smears showed a strong correlation with endocervical involvement by MMMT (p = 0.002). Larger tumors were more likely to involve the cervix (p = 0.0115). Conclusions: The Pap test can predict cervical involvement by MMMT. On Pap smears, MMMT cells showed no correlation with other adverse histological features (lymphovascular invasion, myoinvasion or adnexal involvement).

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