Multiple polypoid lesions of primary mucosa-associated lymphoid-tissue lymphoma of colon

Histopathology. 1998 Feb;32(2):116-25. doi: 10.1046/j.1365-2559.1998.00315.x.


Aims: This study was focused on unusual cases of mucosa-associated lymphoid tissue (MALT) lymphoma presenting with multiple polypoid lesions of the colon and rectum with a special reference to the differential diagnosis of mantle cell lymphoma.

Methods and results: The lesions of these five cases grossly showed a segmental distribution of nodular protrusions in three patients and of innumerable small polyps in two. These patterns of involvement simulated those of multiple lymphomatous polyposis, known as the gastrointestinal presentation of mantle cell lymphoma (MCL), and caused a differential diagnostic problem between MALT lymphoma and MCL, which have different prognostic and therapeutic implications. Their histological features are almost indistinguishable from each other, especially in the small biopsy specimens via endoscope. The most important procedure for their differentiation is cyclin D1 immunohistochemistry and its negative reaction provides strong indication of MALT lymphoma. Of interest, one case showed a rare karyotypic abnormality of t(11;18)(q21;q21), which has been reported specifically in MALT lymphoma.

Conclusions: This study has indicated that the multiple polypoid lesions of the colon occur not only in MCL, but also in MALT lymphoma, making differential diagnosis between the two entities necessary, and cyclin D1 immunohistochemistry is indispensable for distinguishing between them.

Publication types

  • Case Reports
  • Comparative Study

MeSH terms

  • Adult
  • Aged
  • Colonic Polyps / genetics
  • Colonic Polyps / immunology
  • Colonic Polyps / pathology*
  • Colorectal Neoplasms / genetics
  • Colorectal Neoplasms / immunology
  • Colorectal Neoplasms / pathology*
  • Diagnosis, Differential
  • Female
  • Humans
  • Immunohistochemistry
  • Lymphoma, B-Cell, Marginal Zone / genetics
  • Lymphoma, B-Cell, Marginal Zone / immunology
  • Lymphoma, B-Cell, Marginal Zone / pathology*
  • Lymphoma, Non-Hodgkin / pathology
  • Male
  • Middle Aged
  • Neoplasms, Multiple Primary / genetics
  • Neoplasms, Multiple Primary / immunology
  • Neoplasms, Multiple Primary / pathology