Ultrasonographic Evaluation of Uterine Volume Variations - Revista Brasileira de Ginecologia e Obstetrícia

Purpose: to determine the accuracy of transabdominal ultrasound (TAUS) in revealing physiological and pathological changes in uterine volume, and to compare uterine volume detected by TAUS and by transvaginal ultrasound (TVUS) in an attempt to determine the relationship between the two methods. Methods: a total of 1,186 pelvic echographic examinations (TAUS and TVUS) were first reviewed retrospectively in terms of the major diseases and indications for the examinations. A total of 480 TAUS examinations without uterine disease were then selected and uterine volume was correlated with age and parity. Finally, a retrospective study was conducted to compare the uterine volume of 50 women obtained by TAUS and TVUS. Data were analyzed statistically by Student’s t-test and Spearman and Pearson correlation. Results: correlating with parity, volume was 44.4 cm³ for P = 0 (n = 99), 58.5 cm³ for P = 1 (n = 72), 75.8 cm³ for P = 2-3 (n = 137), 88cm³ for P = 4-5 (n = 56), and 105cm³ for P = 6 or more (n = 26), showing a positive correlation between parity and uterine volume. Calculation of Spearman’s correlation coefficient yielded r = 0.59 and p = 0.001 and calculation of Pearson’s correlation coefficient yielded r = 0.55 and the same p value. There were no significant differences between the uterine volumes detected by TAUS and TVUS. Conclusions: the volume increases with parity and changes with age, and these modifications are detected by TAUS. The two methods (TAUS and TVUS) are equivalent in determining the uterine volume; however, when TAUS is used, bladder filling allows a better evaluation of the uterine length.