title: Massive crystal-storing histiocytosis associated with low-grade malignant B-cell lymphoma of MALT-type of the parotid gland.
abstract: Massive crystal deposition is unusual in lymphoproliferative disorders. In this report, a mucosa-associated lymphoid tissue (MALT) low-grade B-cell lymphoma of the parotid gland containing large numbers of crystal-storing histiocytes is described. The patient, an 81-yr-old female, presented with a history of long-standing left parotid gland enlargement. FNA cytology of the tumor showed a lymphoplasmacytic infiltrate and sheets of large benign histiocytes with abundant eosinophilic intracytoplasmic inclusions. Paraffinsection immunohistochemistry performed on the cell block demonstrated that the histiocytic cells were immunoreactive for the KP-1 (CD-68) antibody and monotypic for cytoplasmic IGM and L-light chain. The cytological diagnosis was consistent with a low-grade B-cell lymphoma with plasmacytic differentiation associated with crystal-storing histiosis. A periparotid lymph node was biopsied and showed involvement by a monocytoid B-cell lymphoma with plasmacytic differentiation and crystal-storing histiocytosis in the pericapsular region.
authors.affiliation: Department of Pathology, Hospital Dr. Josep Trueta, Girona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Llobet
authors.forename: P
authors.initials: P
authors.lastname: Castro
authors.forename: C
authors.initials: C
authors.lastname: Barceló
authors.forename: J M
authors.initials: JM
authors.lastname: Trull
authors.forename: E
authors.initials: E
authors.lastname: Campo
authors.forename: L
authors.initials: L
authors.lastname: Bernadó
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015703:Antigens, CD / Q000032:analysis; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D001707:Biopsy, Needle; D003460:Crystallization; D005260:Female; D006644:Histiocytes / Q000737:chemistry / Q000473:pathology; D015614:Histiocytosis / Q000150:complications / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007147:Immunoglobulin Light Chains / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D007150:Immunohistochemistry; D018442:Lymphoma, B-Cell, Marginal Zone / Q000737:chemistry / Q000473:pathology*; D010307:Parotid Neoplasms / Q000737:chemistry / Q000473:pathology*; D000097382:CD68 Molecule
chemical_list: D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D007147:Immunoglobulin Light Chains; D007075:Immunoglobulin M; C067980:CD68 antigen, human; D000097382:CD68 Molecule