IGHE and Lymphadenopathy: Another study observed elevated mast cells expressing cytoplasmic IgE and high‐affinity IgE receptor FcεRI in tissue samples from IgG4‐related lymphadenopathy compared to non‐specific lymphoid hyperplasia, suggesting the possible internalisation of the IgE and FcεRI when compared to non‐specific lymphoid hyperplasia [113].