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i-Scan high-definition white light endoscopy and colorectal polyps: prediction of histology, interobserver and intraobserver agreement

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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Purpose

Aim of the study was the evaluation of high-definition white light (HDWL) i-Scan endoscopy for diagnostic prediction of histology, inter- and intraobserver agreement for colorectal polyps.

Methods

In this prospective single-center cohort study, a skilled endoscopist, with HDWL i-Scan, predicted on real-time the histology of 150 polyps from 78 patients undergoing colonoscopy. Subsequently, four endoscopists, not involved in the collection of cases, predicted the polyps' histology (neoplastic vs nonneoplastic) and repeated the assessment after 6 months.

Results

Real-time assessment of the lesions predicted a correct histology in 138/150 cases with a sensitivity, specificity, and accuracy of 95, 82, and 92 %, respectively. Sensitivity, specificity, and accuracy of post-acquisition evaluation were 87.7, 61.7, and 82.2 %, respectively. The κ values of inter- and intraobserver agreement of prediction of histology were 0.462 (0.373–0.537) and 0.657 (0.523–0.917). Among the subset of polyps (n = 82) with good/excellent quality image, sensitivity and accuracy of HDWL i-Scan improved (97 %, p = 0.003 and 94 %, p = 0.002, respectively) as well as κ value of interobserver agreement (0.699).

Conclusions

HDWL i-Scan technology helps for characterization of polyps of the colon with good accuracy even if it cannot replace, at the moment, the histopathological examination. Reproducibility among operators is supported by a moderate substantial interobserver and intraobserver agreement.

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Authors and Affiliations

  1. Digestive Endoscopy Unit, New Civil Hospital S. Agostino Estense of Modena, Modena, Italy

    Flavia Pigò, Helga Bertani, Mauro Manno, Vincenzo Mirante, Angelo Caruso, Carmelo Barbera, Raffaele Manta, Gianpiero Olivetti & Rita Luisa Conigliaro

  2. Gastroenterology and Hepatology Section, Clinical and Experimental Medicine, University of Perugia, Perugia, Italy

    Gabrio Bassotti

  3. Via Tommaso Albinoni 19/2, 40050, Castello d’Argile, Bologna, Italy

    Flavia Pigò

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  1. Flavia Pigò
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  2. Helga Bertani
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  3. Mauro Manno
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  4. Vincenzo Mirante
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  5. Angelo Caruso
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  6. Carmelo Barbera
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  8. Gabrio Bassotti
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  9. Gianpiero Olivetti
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  10. Rita Luisa Conigliaro
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Correspondence to Flavia Pigò.

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Pigò, F., Bertani, H., Manno, M. et al. i-Scan high-definition white light endoscopy and colorectal polyps: prediction of histology, interobserver and intraobserver agreement. Int J Colorectal Dis 28, 399–406 (2013). https://doi.org/10.1007/s00384-012-1583-7

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  • DOI: https://doi.org/10.1007/s00384-012-1583-7

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