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Injection of methylene blue solution into the inferior mesenteric artery of resected rectal specimens for rectal cancer as a method for increasing the lymph node harvest

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Abstract

Background

The aim of the present study was to determine whether the injection of methylene blue solution into the inferior mesenteric artery could improve the lymph node harvest in rectal specimens of rectal cancer patients treated with rectal resection with total mesorectal excision.

Methods

The study group consisted of 20 randomly selected fresh rectal specimens from patients with stages I-III rectal cancer treated at the Surgery Clinic at the Institute of Oncology of Vilnius University during the period from February 2008 to December 2010, and 20 specimens were selected under the same conditions to serve as the control group. The patients underwent conventional rectal resection with total mesorectal excision and coloanal anastomosis for low rectal cancer performed by the same surgeon, did not receive preoperative radiotherapy and had no distant metastases. After the removal of the specimen, 30 ml of 0.5% methylene blue solution was injected into the inferior mesenteric artery of the specimens in the study group (methylene blue group). The specimens from both the methylene blue and control groups were examined using the standards established by the Lithuanian National Centre of Pathology. The pathologist was not required to make any special macroscopic preparations. A retrospective analysis of clinical and histopathological records was performed.

Results

Comparison of the mean lymph node harvest showed a significant difference between methylene blue and control groups with average lymph node numbers per specimen of 18 ± 5 and 14 ± 6, respectively (p = 0.025). The specimens from 12 of the 20 patients in the methylene blue group and the specimens from 7 of the 20 patients from the control group had positive nodes.

Conclusions

Injecting methylene blue solution into the inferior mesenteric artery is an efficient and simple method for improving the lymph node harvest in the histopathological examination of rectal specimens of rectal cancer patients treated with rectal resection with total mesorectal excision.

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Conflict of interest

The authors declare that no conflict of interest exists.

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Authors and Affiliations

  1. Faculty of Medicine, Vilnius University, Čiurlionio str. 21, LT-03101, Vilnius, Lithuania

    E. Klepšytė & N. Evaldas Samalavičius

  2. Clinic of Surgery, Institute of Oncology, Vilnius University, Santariškių str. 1, LT-08660, Vilnius, Lithuania

    E. Klepšytė & N. Evaldas Samalavičius

  3. Family Medicine and Oncology, Clinic of Internal, Faculty of Medicine, Vilnius University, Santariškių str. 2, LT-08661, Vilnius, Lithuania

    E. Klepšytė & N. Evaldas Samalavičius

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  1. E. Klepšytė
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  2. N. Evaldas Samalavičius
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Correspondence to E. Klepšytė.

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Klepšytė, E., Samalavičius, N.E. Injection of methylene blue solution into the inferior mesenteric artery of resected rectal specimens for rectal cancer as a method for increasing the lymph node harvest. Tech Coloproctol 16, 207–211 (2012). https://doi.org/10.1007/s10151-012-0816-7

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  • DOI: https://doi.org/10.1007/s10151-012-0816-7

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