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Related Experiment Videos

Large colorectal adenomas. An approach to pathologic evaluation.

E D Euscher1, T H Niemann, J G Lucas

  • 1Dept of Pathology, Ohio State University, 416A Doan Hall, 410 W 10th St, Columbus, OH 43202, USA.

American Journal of Clinical Pathology
|September 14, 2001
PubMed
Summary

Large adenomatous polyps (adenomas) require complete histologic examination. Embedding entire large polyps increases the detection rate of high-grade dysplasia and invasive cancer, crucial for accurate diagnosis.

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Area of Science:

  • Gastroenterology
  • Surgical Pathology
  • Oncology

Background:

  • Adenomatous polyps are common neoplastic lesions in the large intestine.
  • Carcinoma risk escalates with polyp size.
  • Standardized sampling methods for large polyps are lacking.

Purpose of the Study:

  • To determine the prevalence of high-grade dysplasia (HGD) and invasive cancer (IC) in large, grossly noninvasive adenomas (≥2.5 cm).
  • To propose an optimal evaluation strategy for these lesions.

Main Methods:

  • Retrospective review of 43 colon resections with totally embedded, grossly noninvasive adenomas (≥2.5 cm).
  • Histologic examination to identify HGD and IC.
  • Probability analysis to assess detection rates based on sampling methods.

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Main Results:

  • 28% of large adenomas contained HGD (ranging from 3% to 100% of slides).
  • 12% of large adenomas harbored IC (ranging from 4% to 42% of slides).
  • All cases with IC also showed HGD in other examined slides.

Conclusions:

  • Complete histologic embedding of grossly noninvasive adenomas ≥2.5 cm is recommended.
  • This approach maximizes the probability of detecting HGD and IC.
  • Ensures accurate staging and appropriate patient management.