Contrast vaginography is more accurate than the radiopaque rod for localization of the vagina.
OBJECTIVE
To compare the radiopaque vaginal rod method with contrast vaginography in localization of the vagina.


METHODS
In 25 female patients who needed pelvic radiotherapy, both our standard localization procedure using the vaginal rod and a localization procedure using contrast vaginography were performed. As a rod can change the position of the vagina, contrast vaginography was considered to display the true anatomic position of the vagina. The corresponding rod and nonrod X-rays of each patient were compared. The distance from the true vaginal apex to the displaced vaginal apex (= the top of the rod) was measured in the sagittal plane. This distance was called the inaccuracy of the rod method. Furthermore, the size of the vaginal vault was measured using the contrast vaginography.


RESULTS
The median inaccuracy of the rod method was 13 mm (range 2 to 24 mm). The maximal width of the vagina ranged from 24 to 68 mm in the frontal plane (median 39 mm) and from 3 to 22 mm in the sagittal plane (median 10 mm).


CONCLUSIONS
The rod method is not accurate to localize the vagina. Furthermore, the rod gives no information on the actual size of the vaginal vault. Contrast vaginography is the method of choice to localize the vagina.
Wiggenraad
R G
RG
Department of Radiotherapy, Haaglanden Medical Centre, The Hague, The Netherlands. wiggenraad@westeinde.ziekenhuis.nl
Coerkamp
E G
EG
Tamminga
R I
RI
Wiersma
T G
TG
Sorge
A A
AA
D003287:Contrast Media; D003974:Diatrizoate Meglumine; D005260:Female; D006801:Humans; D011859:Radiography; D011878:Radiotherapy / Q000295:instrumentation; D014621:Vagina / Q000033:anatomy & histology / Q000000981:diagnostic imaging*
D003287:Contrast Media; D003974:Diatrizoate Meglumine