Colon tumor
Carcinoma
Lymphoepithelioma-like carcinoma


Topic Completed: 1 November 2015

Revised: 26 June 2019

Copyright: 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Lymphoepithelioma-like carcinoma [title] colon

Raul S. Gonzalez, M.D.
Page views in 2018: 748
Page views in 2019 to date: 419
Cite this page: Gonzalez R. Lymphoepithelioma-like carcinoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/colontumorLEL.html. Accessed July 20th, 2019.
Definition / general
  • Extremely rare subtype of colonic adenocarcinoma (< 10 reported cases) associated with Epstein-Barr virus infection
  • Only case reports exist, though some may actually be medullary carcinoma (see differential diagnosis section)
Essential features
Terminology
  • May also be called "poorly differentiated adenocarcinoma with lymphoid stroma"
Clinical features
  • No particular age, sex or site predilection
Case reports
Clinical images

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Colonoscopy findings

Microscopic (histologic) description
  • Syncytial growth pattern of undifferentiated pleomorphic malignant epithelial cells with ill defined borders, prominent nucleoli and brisk mitotic activity
  • Prominent stromal and intratumoral lymphoid infiltrate
  • Focal necrosis
  • Infiltrative margins
Microscopic (histologic) images

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Lymphoid follicle formation

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Polypoid nature

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Cords and clusters

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Pleomorphic with large nuclei

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Bladder tumor

Positive stains
  • EBV / EBER positivity in tumor cells reported in some but not all cases
    • Other times, only surrounding lymphocytes are positive
  • Cytokeratin AE1 / AE3
Negative stains
  • Neuroendocrine markers, S100
Differential diagnosis
  • Medullary carcinoma: lymphocytic infiltrates are more prominent peritumorally than intratumorally; pushing, not infiltrative, margins; distinction not always perfect on H&E
  • In the stomach, "medullary gastric cancer" should be used for mismatch repair deficient tumors and "lymphoepithelioma-like gastric cancer" should be used for EBER+ cases
    • Such a distinction may carry over to the colon, but the morphologic overlap and rarity of EBV+ colon cancers makes this difficult to determine
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