The lipids are a large and diverse group of naturally occurring organic compounds that are related by their solubility in nonpolar organic solvents (e.g. ether, chloroform, acetone & benzene) and general insolubility in water.hospholipids are the main constituents of cell membranes. They resemble the triglycerides in being ester or amide derivatives of glycerol or sphingosine with fatty acids and phosphoric acid.
As of now, research doesnât clearly indicate a specific cause of rheumatoid nodules and why exactly they develop in some patients and not in others. Given they generally form on extensor joints, rheumatoid nodules could be the result of repeated pressure on the affected joints over time.
An inflammatory nodule, caused by chronic inflammation of the thyroid, is one common type of nodule. Colloid nodules are another kind of nodule that may be seen in patients presenting with this type of thyroid mass. These overgrowths of tissue may become large, but do not grow past the area of the thyroid.