Digestive Diseases and Sciences

, Volume 57, Issue 3, pp 764–770 | Cite as

Proficiency in the Diagnosis of Nonpolypoid Colorectal Neoplasm Yields High Adenoma Detection Rates

  • Tonya Kaltenbach
  • Sarah K. McGill
  • Venkat Kalidindi
  • Shai Friedland
  • Roy Soetikno
Original Article


Background and Aims

Current efforts to prevent colorectal cancer focus on the detection and removal of neoplasms. Nonpolypoid colorectal neoplasms (NP-CRN) have a subtle appearance that can be difficult to recognize during colonoscopy. Endoscopists must first be familiar with the patterns of NP-CRN in order to detect and diagnose them. We studied the adenoma detection rates of endoscopists who had trained to detect NP-CRN, versus endoscopists who had not.

Materials and Methods

Design: Retrospective Nested Case Control Study. Setting: Outpatient Screening Colonoscopy. Participants: Adult Veterans. Intervention: Proficiency in the features and diagnosis of NP-CRN. Main Outcomes Measurements: Adenoma detection.


In total, 462 patients had screening colonoscopies—267 by colonoscopists who had trained in the features and diagnosis of NP-CRN. Patient characteristics were similar between groups—the majority were men with a mean age of 62 ± 6 years. Neoplasia was more prevalent (45.7 vs. 34.9%; p = 0.02) in patients evaluated by the trained compared to the conventionally trained group. Trained colonoscopists had a higher adenoma detection rate (0.76 vs. 0.54 adenomas per patient, p < 0.001); removed a higher proportion of neoplasia (77 vs. 35%, p < 0.001); and more frequently diagnosed NP-CRN lesions (OR 2.98, 95% CI: 1.46–6.08) compared to colonoscopists without supplemental training.


Endoscopists who are proficient in the detection of NP-CRN had significantly higher adenoma detection rates—of both polypoid and flat adenomas—compared to endoscopists without training, and were more specific in resection of adenomatous over hyperplastic lesions.


Colonoscopy Endoscopy lower GI tract Adenoma detection Nonpolypoid Polyp Neoplasm Cancer 



Nonpolypoid colorectal neoplasm


Conflict of interest



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Copyright information

© Springer Science+Business Media, LLC (Outside the USA) 2011

Authors and Affiliations

  • Tonya Kaltenbach
    • 1
  • Sarah K. McGill
    • 1
  • Venkat Kalidindi
    • 1
  • Shai Friedland
    • 1
  • Roy Soetikno
    • 1
  1. 1.Gastroenterology Section, Veterans Affairs Palo Alto Healthcare System, Division of GastroenterologyStanford University School of MedicinePalo AltoUSA

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