What are lymphoid polyps (lymphoid nodular hyperplasia)?

Updated: Jun 06, 2020
  • Author: Jaime Shalkow, MD, FACS; Chief Editor: Cameron K Tebbi, MD  more...
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Answer

Answer

Lymphoid polyps (present in 15% of patients) are hyperplastic submucosal lymphoid aggregates, most likely due to a nonspecific infection (exposure to bacteria and viruses). Submucosal lymphoid tissue is prominent in children, particularly in the distal ileum (Peyer patches). These non-neoplastic polyps may occur in the rectum, colon, and terminal ileum.

Macroscopically, they appear as firm, round, submucosal nodules that are smooth or lobulated. They are never pedunculated. They often have a volcano-like appearance with mucosal ulceration, which leads to occult blood loss. Histologically, they are hyperplastic lymphoid follicles with a large germinal center covered by colonic mucosa. They develop in young children, with a peak incidence at age 4 years.

Patients present with anemia or, less frequently, with severe rectal bleeding. Barium enema and colonoscopy findings are helpful (in 50% of patients), and biopsy findings confirm the diagnosis.

Surgery is indicated only for uncontrolled bleeding and intussusception that does not respond to enema treatment. Otherwise, expectant measures are adequate because these polyps are benign and spontaneously regress.


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