IgG4-Related Disease, the Malignancy Mimicker: Case Series from Bahrain

Table 1

Case	Clinical presentation	Initial diagnosis	Treatment	Serum IgG4 level
1	Paravertebral mass	Inflammatory myofibroblastic tumor; Idiopathic retroperitoneal fibrosis	Oral cyclophosphamide; Mycophenolate mofetil; Steroid and rituximab	0.604 mg/dl (after treatment); Pretreatment level is not available
2	Parotid mass; Pachymeninges	Inflammatory pseudotumor; Non-Hodgkin’s lymphoma	Steroid and rituximab; Proton therapy	14.2 mg/dl after steroid treatment; Pretreatment level is not available
3	Proptosis; Lacrimal and salivary gland swelling	Mikulicz syndrome	Steroid and azathioprine	340 mg/dl; Pretreatment level
4	Recurrent pancreatitis	Ampullary adenoma	Whipple’s procedure; Steroid and rituximab	149 mg/dl; Pretreatment level