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Cervical cytology has a high false negative rate, especially for adenocarcinoma and its precursors. This study compares the traditional spatula with the cytobrush. Both the modified Ayre spatula and the cytobrush were found to be inadequate in a significant number of patients with known cytological atypia. It is concluded that inadequate sampling instruments make a contribution to false negative rates and that brush cytology is superior to rigid instrument cytology in routine cervical screening.

Seventy cases of invasive adenocarcinoma of the uterine cervix were predicted on cytological grounds and confirmed by histopathology. The cervical smears from these cases were further analysed and classified into well and poorly differentiated adenocarcinoma on the basis of the pattern of the cells in the smear and their nuclear detail. Using this method of analysis it is possible to increase the accuracy of cytology for the diagnosis of adenocarcinoma of the uterine cervix.

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