Zhiyang Zhou PhD, Abstract Co-Author: Nothing to Disclose

Yanbang Lian, Presenter: Nothing to Disclose

Zhong-Ping Zhang MMedSc, Abstract Co-Author: Nothing to Disclose

Zhicheng He, Abstract Co-Author: Nothing to Disclose

Wuteng CAO, Abstract Co-Author: Nothing to Disclose

Jiaying Gong, Abstract Co-Author: Nothing to Disclose

To compare the diagnostic capability of magnetic resonance defecography with conventional X-ray defecography in obstructed defecation syndrome (ODS).

Thirty-two consecutive patients diagnosed as ODS were enrolled and underwent both MR defecography and conventional X-ray defecography of the ano-rectal region (ARA) within 10 days. T2- weighted fast spin–echo sequences in sagittal, coronal and axial slices and a single sagittal dynamic sequence of fast imaging employing steady state acquisition (FIESTA) for rest,　and defecation phase were acquired on MR system, respectively. The antero-posterior position for rest and post-defecation phase, lateral position for rest, lift and defecation phase were acquired using X-ray defecography. The obtained data sets from both methods regarding to the condition of ODS and its complication were evaluated using the pubococcygeal line (PCL) as the reference line, and the results were compared using a two-tailed McNemar’s test with p<0.05.

No significant difference was observed regarding to the evacuation phase between MR defecography and X-ray defecography (p>0.05) in the presence of rectocele (13 vs 15), puborectalis dyssynergia (5 vs 6), enterocele (1 vs 3), sigmoidocele (2 vs 4). Although MR defecography was inferior (p < 0.05) to X-ray defecography in the assessment of rectal mucosal prolapse (12 vs 22), intrarectal invagination (3 vs 18) and descending perineum (8 vs 21), it demonstrated more complications of the anterior and middle compartment of the pelvic cavity such as cystoptosis and hysteroptosis, and other lesions of the pelvic cavity or pelvic floor. Meanwhile, MR defecography demonstrated better superiority in demonstrating the detailed pelvic anatomy.

MR defecography and X-ray defecography exhibit different advantages in evaluating ODS. MR defecography provides both morphological and functional information for the pelvic floor and plays a significant role in a better evaluation of the entire pelvic anatomy and pelvic organ interaction.

MR defecography provides significant information on the morphology and function of the pelvic floor to ensure an approach in the evaluation of the entire pelvic anatomy and pelvic organ interaction.

Zhou, Z, Lian, Y, Zhang, Z, He, Z, CAO, W, Gong, J, Comparison between MR Defecography and X-ray Defecography in Patients with Obstructed Defecation Syndrome.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14015271.html