Pathology

Key Information

Cell type; size of lesion; number of tumors within organ; number of lymph nodes involved; extension to adjacent tissues (other organs, mesentery); depth of invasion for biliary tract tumors (submucosa, muscularis, serosa); extension from other organs into liver

  • Cytology Reports
  • Abdominal Washings
  • Thoracentesis
  • Paracentesis

Visit the Pathology page of the Diagnostic Tests module for more information.

Suggested Citation

SEER Training Modules: Pathology. U.S. National Institutes of Health, National Cancer Institute. Cited 05 January 2026. Available from: https://training.seer.cancer.gov.