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Takehara M, Muguruma N, Kitamura S, et al. Twin Rectal Tonsils Mimicking Carcinoid or Mucosa-Associated Lymphoid Tissue Lymphoma. Clin Endosc. 2017;50(5):500-503doi: 10.5946/ce.2016.157.
Takehara, M., Muguruma, N., Kitamura, S., Kimura, T., Okamoto, K., Miyamoto, H., Bando, Y., & Takayama, T. (2017). Twin Rectal Tonsils Mimicking Carcinoid or Mucosa-Associated Lymphoid Tissue Lymphoma. Clinical endoscopy, 50(5), 500-503. https://doi.org/10.5946/ce.2016.157
Takehara, Masanori, et al. "Twin Rectal Tonsils Mimicking Carcinoid or Mucosa-Associated Lymphoid Tissue Lymphoma." Clinical endoscopy vol. 50,5 (2017): 500-503. doi: https://doi.org/10.5946/ce.2016.157
Takehara M, Muguruma N, Kitamura S, Kimura T, Okamoto K, Miyamoto H, Bando Y, Takayama T. Twin Rectal Tonsils Mimicking Carcinoid or Mucosa-Associated Lymphoid Tissue Lymphoma. Clin Endosc. 2017 Sep;50(5):500-503. doi: 10.5946/ce.2016.157. Epub 2017 Feb 28. PMID: 28241409; PMCID: PMC5642061.
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Clin Endosc. 2017 Sep;50(5):500-503. doi: 10.5946/ce.2016.157. Epub 2017 Feb 28.

Twin Rectal Tonsils Mimicking Carcinoid or Mucosa-Associated Lymphoid Tissue Lymphoma.

Clinical endoscopy

Masanori Takehara, Naoki Muguruma, Shinji Kitamura, Tetsuo Kimura, Koichi Okamoto, Hiroshi Miyamoto, Yoshimi Bando, Tetsuji Takayama

Affiliations

  1. Department of Gastroenterology and Oncology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan.
  2. Division of Pathology, Tokushima University Hospital, Tokushima, Japan.

PMID: 28241409 PMCID: PMC5642061 DOI: 10.5946/ce.2016.157

Abstract

The rectal tonsil is a rare polypoid lesion exclusively found in the rectum and is considered a reactive proliferation of the lymphoid tissue. Although this lesion is benign, we recommend that it should be differentiated from carcinoid or polypoid type of mucosa-associated lymphoid tissue lymphomas, based on gross findings. In this case report, we describe a case of rectal lesions with a unique appearance in a 41-year-old man. Colonoscopy revealed two 5-mm-sized nodules located opposite from each other on the left and right sides of the lower rectum. Endoscopic mucosal resection was conducted. Histopathologically, both lesions were mainly located in the submucosa and consisted of prominent lymphoid follicles with germinal centers of various sizes. No immunoreactivity of Bcl-2 was seen in the germinal centers. Immunohistochemical staining for kappa and lambda light chains revealed a polyclonal pattern. Therefore, these lesions were diagnosed as rectal tonsils.

Keywords: Endoscopic procedure; Histopathology; Lymphoid hyperplasia; Rectal neoplasia; Submucosal tumor

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