Comparison between magnetic resonance hysterosalpingography and conventional hysterosalpingography: direct visualization of the fallopian tubes using a novel MRI contrast agent mixture.

Background: Magnetic resonance hysterosalpingography (MR-HSG) is a promising technique in the work-up of female infertility. Few existing MR-HSG studies focus on the comparison between MR-HSG with gold standard examination.
Purpose: To compare the diagnostic value of MR-HSG with conventional HSG in patients receiving both exams in one day.
Material and Methods: This study included 33 infertile women who completed pelvic MR scanning, HSG, and MR-HSG in that order. A traditional HSG contrast agent (iohexol) and a magnetic resonance imaging (MRI) contrast agent (1 mL gadopentetate dimeglumine (Gd-DTPA) blended with 100 mL iohexol) were used to achieve image enhancement. Inter-observer and inter-modality agreements of HSG and MR-HSG exams were assessed. The results were calculated by using the kappa test. Three radiologists who were blinded to the clinical data independently reviewed the MR images. Extratubal abnormalities were analyzed.
Results: A total of 62 fallopian tubes of 33 women were included in the study. MR-HSG imaging findings to depict tubal patency were similar to these of HSG (AUC 0.911, sensitivity 0.821, specificity 1.000, positive predictive values 1.000, and negative predictive values 0.872). Pairwise inter-observer agreement among three observers and inter-modality agreement of the diagnosis were excellent (mean kappa 0.863 and 0.835, respectively). In addition, 29 extratubal abnormalities in 21 patients were found on pelvic MR scanning.
Conclusion: MR-HSG and HSG demonstrated similar results in assessing tubal patency. Because it offers the comprehensive assessment of female pelvic structures, and avoids ionizing radiation, MR-HSG may be used as an alternative imaging technique for evaluation of female infertility.