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Tuesday, October 20, 2009

Primary cutaneous marginal zone lymphoma

Primary cutaneous marginal zone lymphoma

Service de dermatologie, Universit├ę Claude Bernard Lyon I, Hospices Civils de Lyon, Lyon, France.

Primary cutaneous marginal zone B-cell lymphoma (PCMZL) is included in the group of extranodal marginal zone B-cell lymphoma involving mucosal sites. Many evidences suggest that chronic antigen stimulation is a key-player in its pathogenesis. While Helicobacter pylori seems not to be implicated in PCMZL, Borrelia Burgdorferi's role is still matter of debate since the results are discordant between European and North American/Asian countries. However Borrelia subspecies are different between the studied areas and this difference could be a confounding factor. Then ubiquitous candidate antigen is still missing. Beyond these discrepancies the treatment of diffuse PCMZL has been recently improved. If local therapies (surgery, radiation) are the gold standard for localized disease, rituximab can also be considered as an alternative for disseminated or plurifocal PCMZL.


Primary cutaneous marginal zone B-cell lymphoma: clinical and histological aspects

Pathologica. 2009 Feb

Department of Dermatology, Charles Nicolle Hospital, Tunis, Tunisia.

According to the WHO-EORTC classification of cutaneous lymphomas, primary cutaneous marginal zone B-cell lymphoma are now well characterized. We report here a case of primary cutaneous marginal zone B-cell lymphoma in a 51 year-old man in which the diagnosis was made using both histology and immunopathology. The patient had no remarkable medical history, no history of either acute inflammation or insect bite, and presented with a 5 cm solitary asymptomatic erythematous firm, multinodular and infiltrated plaque on the back for 12 months. Histological examination and immunohistochemical study of a cutaneous biopsy provided a differential diagnosis between B cell lymphoma and lymphocytoma cutis. Full body work up revealed no signs of extracutaneous dissemination. The patient underwent surgical excision of the nodule. Histological examination showed a histological and immunophenotyping profile typical of primary cutaneous marginal zone B-cell lymphoma. The lesion was completely excised with clear margins and no recurrence occurred after a 12 month-follow-up period. Primary cutaneous marginal zone B-cell lymphoma are low-grade lymphomas that have an indolent course and a high tendency to recur. They should be differentiated from lymphocytoma cutis and from the other types of cutaneous B cell lymphomas that have a different course and prognosis.

PMID: 19771768 [PubMed - in process]

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