Accuracy of risk of malignancy index in preoperative evaluation of adnexal masses

ABSTRACT

To evaluate the diagnostic accuracy of risk of malignancy index [RMI] in discriminating between benign and malignant adnexal masses taking histopathology as the gold standard. Validation study. The study was done at the department of Obstetrics and Gynaecology, Government Lady Aitchison Hospital, Lahore from January 2009 to July 2009. Total 60 patients were included in this study. Risk-of-malignancy Index level [RMI] <200 was taken as benign and RMI >200 was taken as malignant. Histopathology report was followed after surgery. Mean age of the patients was found to be 41.03 +/- 8.59 years. The results of RMI were compared with the histopathology with report at histopathology, 91.7% patients had benign masses and 8.3% patients had malignant masses. At RMI, 88.3% patients had benign masses and 11.7% patients had malignant masses. While RMI findings were confirmed with diagnosis made on histopathology the sensitivity, specificity and diagnostic accuracy were found to be 100%, 96.3%, 96.6%, respectively. Positive and negative predictive values of RMI were 71.4%, and 100%, respectively. RMI is an appropriate tool for diagnosing adnexal masses with high risk of malignancy and referring to specialist gynecological centers for suitable surgical operations