[MR-endoscopic US correlation for loco-regional staging of rectal carcinoma].
BACKGROUND
To correlate findings at high-resolution MR and endoscopic US (EUS) for preoperative loco-regional staging of rectal carcinoma.


METHODS
Fifty-two patients with rectal carcinoma underwent high-resolution MR imaging. Only 43 of these patients underwent EUS due to technical limitations and stenosing carcinomas. Morphological imaging features and TNM staging were evaluated for both imaging modalities. The degree of correlation and accuracy were calculated for both.


RESULTS
The correlation between MR and EUS was good for tumor length and thickness (r=0.7 and 0.61) for for nodal (N) staging (k=0.53). Correlation was good for T1 and T2 stages (k=0.51) and T3 stage (k=0.43) and very poor for stage 4 (k= -0.09), because no T4 lesion was detected at EUS. 81.8% of patients where T stage was over-estimated on MRI and 100% of patients where T stage was over-estimated on EUS had received preoperative radiation therapy. Therefore, results should be interpreted with caution. The predictive evaluation of tumor resectability (absence of perirectal fascia invasion) with a circumferential margin on MR> or =5 mm was 93%.


CONCLUSIONS
Correlation between MR and EUS was moderate for T staging, because of limitations of EUS for large tumors. Results confirm that high-resolution MRI is useful for loco-regional staging of rectal carcinoma, especially for large tumors. EUS should be limited to the valuation of superficial tumors of the rectum.
Anthonioz-Lescop
C
C
Département de Radiologie, Centre hospitalo-universitaire, 4 rue Larrey, Angers Cedex 09.
Aubé
C
C
Luet
D
D
Lermite
E
E
Burtin
P
P
Ridereau-Zins
C
C
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000473:pathology* / Q000601:surgery; D003251:Constriction, Pathologic / Q000473:pathology; D003287:Contrast Media; D019160:Endosonography / Q000379:methods* / Q000706:statistics & numerical data; D005205:Fascia / Q000473:pathology; D000071938:Fasciotomy; D005260:Female; D006801:Humans; D007089:Image Enhancement; D008207:Lymphatic Metastasis / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods* / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D020360:Neoadjuvant Therapy; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011446:Prospective Studies; D018714:Radiotherapy, Adjuvant; D012004:Rectal Neoplasms / Q000473:pathology* / Q000601:surgery; D012007:Rectum / Q000473:pathology / Q000601:surgery
D003287:Contrast Media