RESUMEN
<p><b>OBJECTIVE</b>To evaluate the integrity of the resected mesentery specimen after total mesorectal excision (TME) for low rectal cancer using methylene blue perfusion via the superior rectal artery.</p><p><b>METHODS</b>Twenty patients with low rectal cancer were randomly divided into the methylene blue group (n=10) and the control group (n=10). All the patients received TME and macroscopic examination of the mesorectal surface was performed to evaluate the quality of the surgical specimen. The methylene blue was injected into the specimen postoperatively via superior rectal artery.</p><p><b>RESULTS</b>The mesorectal surface of all the specimens was intact on macroscopic examination. However, after methylene blue perfusion, 2 specimens were found to be incomplete. The number of lymph nodes in the methylene blue group were significantly larger (17.3+/-2.4 vs 12.4+/-5.4, P=0.016).</p><p><b>CONCLUSIONS</b>Integrity evaluation of TME specimen is necessary. Methylene blue perfusion is a convenient and effective method to identify subtle incompleteness of specimen and can improve the detection of lymph node.</p>