IgG4-related fasciitis.

The article describes the case of a 37-year-old Iraqi male, who presented at a rheumatology service with pain, induration and swelling of the right thigh. Topics covered include the medical history of the patient, the findings of the clinical and laboratory examinations which led to the diagnosis of IgG4-related fasciitis with mild adjacent myositis, and patient outcome following treatment with prednisolone and rituximab.