title: Primary low-grade MALT lymphoma of the gallbladder.
abstract: We report a case of primary low-grade B-cell lymphoma of the mucosa-associated lymphoid tissue (low-grade MALT lymphoma) in the gallbladder. A 58-year-old woman suspected of gallbladder carcinoma underwent laparoscopic cholecystectomy. Microscopic examination of the gallbladder demonstrated lymphoid cell infiltration forming lymphoid follicles with hyperplastic secondary follicles. The surrounding monocytoid B cells and centrocyte-like cells selectively infiltrated the crypt epithelium forming lympho-epithelial lesions. Plasma cells were also noted beneath the mucosal epithelium. Bile culture revealed the Gram-negative bacilli Enterococcus faecalis and Morganella morganii. Immunoglobulin heavy chain gene rearrangement was confirmed using polymerase chain reaction (PCR) and oligoclonal lymphoid proliferations was detected. Because autoimmune diseases, or chronic inflammatory disorders, seem to correlate with the occurrence of MALT lymphoma, Gram-negative bacterial infection could also be considered as a prodrome of MALT lymphoma of the gallbladder.
authors.affiliation: First Department of Pathology, Nagasaki University, Nagasaki, Japan. d398035b@stcc.nagasaki-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: I
authors.initials: I
authors.lastname: Shimokawa
authors.forename: Y
authors.initials: Y
authors.lastname: Higami
authors.forename: H
authors.initials: H
authors.lastname: Ohtani
authors.forename: Y
authors.initials: Y
authors.lastname: Shigeoka
authors.forename: K
authors.initials: K
authors.lastname: Ohshima
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
authors.forename: H
authors.initials: H
authors.lastname: Ayabe
mesh_terms: D000951:Antigens, Neoplasm / Q000032:analysis; D001646:Bile / Q000382:microbiology; D014408:Biomarkers, Tumor / Q000032:analysis; D002999:Clone Cells; D004273:DNA, Neoplasm / Q000032:analysis; D013293:Enterococcus faecalis / Q000302:isolation & purification; D005260:Female; D005706:Gallbladder Neoplasms / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D015321:Gene Rearrangement; D006801:Humans; D007124:Immunoenzyme Techniques; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D008875:Middle Aged; D020613:Morganella morganii / Q000302:isolation & purification; D016133:Polymerase Chain Reaction
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D004273:DNA, Neoplasm; D007143:Immunoglobulin Heavy Chains