SerositisSerositis refers to inflammation of the serous tissues of the body, the tissues lining the lungs, heart, and the inner lining of the abdomen and organs within. It is commonly found with fat wrapping or creeping fat.CausesSerositis is seen in numerous conditions:Lupus erythematosus, for which it is one of the criteria,Rheumatoid arthritisFamilial Mediterranean fever Chronic kidney failure / UremiaJuvenile idiopathic arthritisInflammatory bowel disease Acute appendicitisDiffuse cutaneous systemic sclerosis