Clinicopathology of Immunoglobulin G4-Related Chronic Sclerosing Sialadenitis: A Single-Center Study: Objectives
To investigate the clinicopathologic characteristics of patients with immunoglobulin G4–related chronic sclerosing sialadenitis (IgG4-RCSS), a recently recognized disease.
Study Design
Case series with chart review and pathology study.
Settings
Tertiary care hospital.
Subjects and Methods
We evaluated chronic sialadenitis specimens obtained over 11 years using pathologic examination and IgG4 immunohistochemistry staining. The specimens were assigned a revised diagnosis of IgG4-RCSS or chronic sialadenitis not otherwise specified, and clinicopathologic data from each group were compared.
Results
Of the 84 patients, 21 were diagnosed with IgG4-RCSS and 63 with chronic sialadenitis not otherwise specified. IgG4-RCSS patients were older (68.2 ± 13.9 vs 54.2 ± 15.8 years, P = .001), predominantly male (85.7% vs 61.9%, P = .036), and more likely to present with painless swelling (75% vs 44.3%, P = .001) and bilateral involvement (52.4% vs 6.3%, P < .001). Ratio of IgG4-positive plasma cells to IgG-positive plasma cells in IgG4-RCSS tissues was 0.81 ± 0.14. The mean value of serum IgG4 in IgG4-RCSS patients was 918.8 mg/dL.
Conclusion
IgG4-RCSS is more common in older male patients and frequently presents with bilateral involvement. Informing head and neck surgeons of the clinical features of IgG4-RCSS and promoting a combined approach of clinical evaluation, imaging, and biopsy can improve the accuracy of preoperative diagnoses.
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