Ultrasonography findings in immunoglobulin G4-related lymphadenopathy: a report of two cases.

Lymphadenopathy is frequently observed in immunoglobulin G4 (IgG4)-related disease in some cases, and such cases are known as IgG4-related lymphadenopathy. The ultrasonography findings associated with IgG4-related lymphadenopathy have not been described in previous reports. Herein, we describe ultrasonography findings in two cases of IgG4-related lymphadenopathy in conjunction with histopathological findings. Combined ultrasound scanning with Doppler examination accurately represented the specific histopathological features of IgG4-related lymphadenopathy.