Traditional serrated adenoma

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Traditional serrated adenomas
SymptomsMostly no symptoms[1]
ComplicationsColorectal cancer
Usual onset>50 years of age
Diagnostic methodColonoscopy
Frequency<1% of all colon polyps

Traditional serrated adenoma is a precancerous type of bowel polyp.[1] There are usually no symptoms.[1]

It is typically found towards the end of the colon or rectum, when it appears on a stalk, or near the start of the colon, when it appears flat.[1]

Traditional serrated adenomas are a type of serrated polyp, and may occur sporadically or as a part of serrated polyposis syndrome. Traditional serrated adenomas are relatively rare, accounting for less than 1% of all colon polyps.[2][3] Usually, traditional serrated adenomas are found in the distal colon and are usually less than 10 mm in size.[2]



Traditional serrated adenoma with intermediate magnification, showing serrated crypts and cytologic atypia (H&E stain)

Traditional serrated adenomas are characterized by ectopic crypts, pseudostratification, and a villous pattern with stretched nuclei.[4]


Usually found in individuals over the age of 50 years, traditional serrated adenomas affect men and women equally.[2] The overall prevalence of traditional serrated adenomas is less than 1% of the general population.[4] Traditional serrated adenomas are the least common type of serrated polyps found in the colon, accounting for 5% of serrated colon polyps.[5]


  1. 1.0 1.1 1.2 1.3 WHO Classification of Tumours Editorial Board (2019). "6. Tumours of the colon and rectum: colorectal serrated lesions and polyps". Digestive System Tumours (5th ed.). Lyon (France). p. 162. ISBN 978-92-832-4499-8. Archived from the original on 2022-06-13. Retrieved 2022-07-19. {{cite book}}: More than one of |accessdate= and |access-date= specified (help); More than one of |archivedate= and |archive-date= specified (help); More than one of |archiveurl= and |archive-url= specified (help)
  2. 2.0 2.1 2.2 McCarthy, AJ; Serra, S; Chetty, R (2019). "Traditional serrated adenoma: an overview of pathology and emphasis on molecular pathogenesis". BMJ Open Gastroenterology. 6 (1): e000317. doi:10.1136/bmjgast-2019-000317. PMC 6673762. PMID 31413858.
  3. Kalimuthu, Sangeetha N.; Chelliah, Adeline; Chetty, Runjan (15 December 2016). "From traditional serrated adenoma to tubulovillous adenoma and beyond". World Journal of Gastrointestinal Oncology. 8 (12): 805–809. doi:10.4251/wjgo.v8.i12.805. ISSN 1948-5204. PMC 5156846. PMID 28035250.
  4. 4.0 4.1 Crockett, SD; Nagtegaal, ID (October 2019). "Terminology, Molecular Features, Epidemiology, and Management of Serrated Colorectal Neoplasia". Gastroenterology. 157 (4): 949–966.e4. doi:10.1053/j.gastro.2019.06.041. PMID 31323292.
  5. Chetty, R (January 2016). "Traditional serrated adenoma (TSA): morphological questions, queries and quandaries". Journal of Clinical Pathology. 69 (1): 6–11. doi:10.1136/jclinpath-2015-203452. PMID 26553935. S2CID 12982470.