title: Extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue arising in the lateral ventricle.
abstract: Extranodal marginal zone B-cell lymphomas of mucosa-associated lymphoid tissue (MALT) lymphomas are a well-described type of low-grade B-cell non-Hodgkin lymphoma. They typically arise adjacent to mucosal surfaces in the gastrointestinal tract, lung and conjunctiva, and, less frequently, in the skin, salivary gland and thyroid gland. Unusual locations, such as the genitourinary tract, thymus and meninges, have also been reported. We recently encountered a case of an intracranial MALT lymphoma in a 53-year-old man who presented with persistent headaches and a seizure. The lesion developed as a mass within the lateral ventricle, appeared to be arising from the choroid plexus, and was not associated with meninges. Histologically, there was a vaguely nodular, dense lymphoid infiltrate with occasional benign follicles colonized by marginal zone lymphoma, suggesting derivation from a focus of prior inflammation. Translocations involving the MALT1 gene were not identified but karyotypic evaluation highlighted a complex cytogenetic profile with many chromosomal abnormalities. This rare case provides insight into the pathophysiology of MALT lymphomas.
authors.affiliation: Division of Pathology and Laboratory Medicine, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, Ohio 44195, USA.
authors.forename: Todd W
authors.initials: TW
authors.lastname: Kelley
authors.forename: Richard A
authors.initials: RA
authors.lastname: Prayson
authors.forename: Gene H
authors.initials: GH
authors.lastname: Barnett
authors.forename: Glen H J
authors.initials: GH
authors.lastname: Stevens
authors.forename: James R
authors.initials: JR
authors.lastname: Cook
authors.forename: Eric D
authors.initials: ED
authors.lastname: Hsi
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000378:metabolism / Q000473:pathology*; D005260:Female; D006801:Humans; D020547:Lateral Ventricles / Q000378:metabolism / Q000473:pathology*; D018442:Lymphoma, B-Cell, Marginal Zone / Q000378:metabolism / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D017464:Receptors, Complement 3d / Q000378:metabolism
chemical_list: D017464:Receptors, Complement 3d