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The depth of myometrial infiltration by endometrial cancer is an important prognostic factor. The examination of the depth of infiltration classifies the patients in the low- and high-risk groups, which influences the therapeutic approach. Transvaginal ultrasonography represents a first-choice diagnostic test for the assessment of the depth of myometrial infiltration as the time consumption and financial demands of magnetic resonance imaging need to be taken into account. In comparison with the MRI, the diagnostic accuracy of the transvaginal ultrasound depends more on the individual experience and professional potential of the examining physician. This fact can contribute to the heterogeneity of published results of transvaginal ultrasound on the determination of infiltration depth. Having in mind the aim to verify these indicators in our local conditions and environment, we decided to prospectively study 150 endometrial cancer patients who were examined with the transvaginal ultrasound in the period 1/2009 - 10/ 2011. Correlated firstly with the preoperative and then secondly with the definitive histopathological examination was the depth-of-infiltration-related data that had been taken from the ultrasound findings. The output being monitored was the exclusion or confirmation of the invasion exceeding half the thickness of myometrium. In our study, the diagnostic accuracy of the method reached 82.67 %, while the other indicators were as follows: sensitivity 92.31 %, specificity 79.28 %, positive predictive value (PPV) 61.02 %, negative predictive value (NPV) 96.7 %, the likelihood ratio of a positive test 4.455 and the likelihood ratio of a negative test 0.097. The results of the depth of myometrial infiltration examination and their comparison with the data from similarly oriented clinical studies entitle us to include this examination in the set of standard preoperative methods used for the examination of patients with endometrial cancer (Tab. 3, Fig. 5, Ref. 20).

Transvaginal ultrasound examination of myometrial infiltration by endometrial cancer