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Fibrinous Peritonitis in a Patient with Rheumatoid Arthritis

have been reported.3 Average age at presentation is around 53 years but the youngest patient was 7. The condition can affect not only the bones and retroperitoneum, as in this case, but also the hypothalamic/pituitary axis (leading to diabetes insipidus), the pericardium, the lungs and the skin (xanthomas).3–5 The most common presenting complaint is bone pain along with general symptoms such as fever, weight loss and weakness.4 Hydronephrosis is due to infiltration of retroperitoneal fat.7 The prognosis depends largely on the extent and distribution of extraosseous disease. Systemic corticosteroids, chemotherapy and radiation treatment have all been used but formal trials are lacking.