Table 1 Clinical, histological and immunohistochemical findings in three patients with gastric plasma cell crystals.

	Age, sex	Symptoms/endoscopy	Gastric biopsy findings	PCC	IHC in PCC	Other findings	Follow‐up
Case 1	82, M	Dyspepsia, antral gastritis	Moderate acute and chronic gastritis. HP present	Focal, up to 32/HPF	IgA λ	No PCC in duodenal, colonic or rectal biopsies No paraprotein on serum electrophoresis	Died of unrelated causes 4 months after biopsy
Case 2	81, M	Dysphagia, oesophagitis	Mild acute and chronic gastritis. HP present	Focal, up to 2/HPF	Insufficient PCC for assessment	No PCC in duodenal, ileal or rectal biopsies	No gastric symptoms 14 months after biopsy
Case 3	52, F	Diarrhoea, oesophagitis, antral erosion	Moderate acute and chronic gastritis. HP present	Focal, up to 5/HPF	IgA λ	No PCC in oesophageal biopsies	No gastric symptoms 6 months after biopsy History of hypertension and hypothyroidism

F, female; HP, Lelicobacter pylori; HPF, high‐power field (×400 magnification); IgA, immunoglobulin A; IHC, immunohistochemistry; M, male; PCC, plasma cells with crystals.