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.
Granulomas can also be caused by other infections, including coccidiomycosis and cryptococcosis. Pulmonary nodules can be caused by noninfectious conditions such as Wegener's granulomatosis, rheumatoid arthritis and sarcoidosis. Neoplasms can lead to pulmonary nodules, notes Cleveland Clinic. Neoplasms can be benign or malignant. Benign neoplasms may be hamartomas, neurofibromas, blastomas or fibromas. Malignant neoplasms may be caused by lung cancer, or these neoplasms may be sarcomas, carcinoids, lymphomas or metastatic tumors.