Abstract：
:Pulmonary nodular lymphoid hyperplasia (PNLH) may show heavy lymphoplasmacytic infiltrates with increased immunoglobulin G4 (IgG4)-positive plasma cells as in IgG4-related disease (IgG4-RD). However, it is unclear whether PNLH could be a manifestation of IgG4-RD. A recent study reported the presence of Epstein-Barr virus (EBV) in IgG4-related lymphadenopathy. We postulated that a subset of PNLH might represent IgG4-related lung disease with EBV-positive lymphocytes as has been reported in IgG4-related lymphadenopathy. IgG and IgG4 immunohistochemistries were performed on 26 PNLH cases in our files (1994-2014) and on 9 controls including diffuse lymphoid hyperplasia of the lung without nodularity (n=2), usual interstitial pneumonia with increased lymphoplasmacytic infiltrates (n=5), and thoracic lymphadenopathy (n=2). EBV in situ hybridization was performed in the cases with the highest IgG4+ count (n=15). Median IgG4+ plasma cell count in PNLH was 36 cells per high-power field (interquartile range, 7-65) with median IgG4+/IgG+ ratio of 0.24 (interquartile range, 0.12-0.37). Three of 26 cases had a markedly increased IgG4+ count (range, 55-139) and IgG4+/IgG+ ratio (>0.4). Serum IgG4 level available in 1 of these cases was not elevated, and all 3 patients had alternate medical diagnoses. Absolute counts of IgG4+ plasma cells in PNLH did not significantly differ from the other control groups. Result of EBV in situ hybridization was negative in all cases tested. In conclusion, most PNLH cases had low IgG4+ cells, and there was no clinical evidence of IgG4-RD or EBV among those with increased IgG4+ cells.
journal_name
Hum Patholjournal_title
Human pathologyauthors
Bois MC,Sekiguchi H,Ryu JH,Yi ESdoi
10.1016/j.humpath.2016.09.016subject
Has Abstractpub_date
2017-01-01 00:00:00pages
80-86eissn
0046-8177issn
1532-8392pii
S0046-8177(16)30236-2journal_volume
59pub_type
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