Pathologic manifestations of Immunoglobulin(Ig)G4-related lung disease.

Published on Nov 1, 2012in Seminars in Diagnostic Pathology2.511
· DOI :10.1053/J.SEMDP.2012.07.002
Eunhee S. Yi47
Estimated H-index: 47
(Mayo Clinic),
Hiroshi Sekiguchi16
Estimated H-index: 16
(Mayo Clinic)
+ 2 AuthorsThomas V. Colby105
Estimated H-index: 105
(Mayo Clinic)
Immunoglobulin(Ig)G4-related disease (IgG4-RD) is a fibroinflammatory condition that can affect virtually any organ and usually presents as tumefactive lesions involving multiple sites. Characteristic histopathology of IgG4-RD consists of dense lymphoplasmacytic infiltrate, fibrosis (often in storiform pattern), and obliterative phlebitis, accompanied by tissue infiltration of IgG4-positive plasma cells with or without elevation of serum IgG4 level. Despite a general similarity in the morphologic manifestations of IgG4-RD, site-specific unique morphologic features have been described in some organs including the lung. Compared with other sites, pulmonary involvement by IgG4-RD has been recognized more recently, and lung biopsy interpretation for this condition is often challenging, as both a relative paucity of pathognomonic features and a plethora of overlapping findings with other fibroinflammatory processes of the lung. This review is focused on the morphologic spectrum of IgG4-related lung disease documented in the current literature and on the pertinent issues in the differential diagnoses with other conditions encountered in the lung.
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