Salivary glands


IgG4 related sialoadenitis

Topic Completed: 1 October 2015

Minor changes: 7 April 2021

Copyright: 2002-2021,, Inc.

PubMed Search: IgG4 related dacryoadenitis and sialoadenitis

Sally Tanakchi, M.D.
F. Zahra Aly, M.D., Ph.D.
Page views in 2021 to date: 2,198
Cite this page: Tanakchi S, Aly FZ. IgG4 related sialoadenitis . website. Accessed December 2nd, 2021.
Definition / general
  • Presents as painless, bilateral enlargement of lacrimal and salivary glands with mild secretory dysfunction
  • IgG4 related disease is now recognized as systemic disorder, characterized by high serum IgG4, marked infiltration of IgG4 positive plasma cells and severe fibrosis
  • Diagnosis depends on histologic appearance, elevated ratio of IgG4/IgG, variable elevated serum IgG4 levels
  • Submandibular gland biopsy is more useful than labial salivary gland biopsy
  • Corticosteroids and rituximab (by targeting peripheral CD20 positive plasma cells) appear to be effective for IgG4 related diseases
  • Previously called Mikulicz disease and Mikulicz syndrome, but these terms are considered ambiguous and outdated by some sources
Case reports
Gross description
  • Solid, gray-white areas and occasional cysts
Microscopic (histologic) description
  • Lymphoplasmacytic infiltration with lymphoid follicles surrounding solid epithelial nests (epimyoepithelial islands)
  • Also scattered histiocytes and dendritic cells
  • Excess hyaline basement membrane material deposited between cells
  • Mild acinar destruction, lymphoepithelial lesions, monocytoid B cells
  • Fibrosis has a characteristic irregular whorled pattern, termed "storiform fibrosis"
  • Multiple germinal center formation in granular tissue
Microscopic (histologic) images

Images hosted on other servers:
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Figure 2B

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Lacrimal gland

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IgG4 positive plasma cells

Differential diagnosis
  • Sjögren syndrome: no association with IgG4, female predominance, presence of SS-A and SS-B antibodies, severe acinar destruction
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