Journal of Ultrasound in Medicine, Vol 13, Issue 6 429-434, Copyright © 1994 by American Institute of Ultrasound in Medicine
Accuracy of endovaginal sonography for the detection of fallopian tube blockage
M. Atri, C. N. Tran, P. M. Bret, A. E. Aldis and G. M. Kintzen
Department of Radiology, Montreal General Hospital, Quebec, Canada.
The patency of 814 fallopian tubes in 414 patients was evaluated by
endovaginal sonography immediately prior to hysterosalpingography. In the
659 fallopian tubes that were normal with free spillage, endovaginal
sonography did not reveal any tubal or peritubal abnormality (specificity
100%). Of the 64 fallopian tubes with definite hydrosalpinx on
hysterosalpingography, only 22 were detected on endovaginal sonography
(sensitivity 34%). Four of 57 (7%) fallopian tubes with definite proximal
blockage on the hysterosalpingogram showed hydrosalpinx on the same side on
endovaginal sonography, indicating the association of proximal and distal
tubal blockages in a small group of patients with blocked fallopian tubes.
This combination can only be detected by the addition of endovaginal
sonography to hysterosalpingography. Ten of 11 (91%) hydrosalpinges in
seven patients who underwent endovaginal sonography immediately after
hysterosalpingography were detected by ultrasonography. Only two of these
had been visible on pre-hysterosalpingography endovaginal sonograms. This
would indicate that the poor sensitivity of endovaginal sonography for
diagnosing hydrosalpinx is at least partly due to its lack of distention.
We conclude that an abnormal endovaginal sonogram is highly predictive of
the presence of a blocked tube, but endovaginal sonography has a poor
sensitivity for the diagnosis of a hydrosalpinx detectable by
hysterosalpingography. Endovaginal sonography would be useful to detect a
combination of proximal and distal blockage in a subgroup of patients with
tubal blockage.