Chronic ulcerative oesophagitis rich in <scp>IgG4</scp> ‐positive plasma cells – a distinct clinicopathological entity

Chronic ulcerative oesophagitis rich in IgG4-positive plasma cells may exert a severe clinical impact on affected individuals but appears to respond well to corticosteroid therapy. This case series demonstrates clinicopathological findings of the disorder and highlights the importance of IgG4 immunohistochemistry in therapy-refractory cases of chronic oesophageal ulceration with dense plasma cell-rich inflammation.