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Quick Answer. Liver nodules, usually a sign of liver disease, can be caused by certain parasitic or viral infections, immune system abnormalities, cancer and genetic conditions, according to Mayo Clinic. Contributing factors include heavy alcohol or drug use, unprotected sex, obesity, diabetes and exposure to certain chemicals.
The nodule is small, has a smooth border, and has a solid and even appearance on an x-ray or CT scan. You are young and do not smoke. Your doctor may then choose to just watch the nodule on x-rays. Repeat chest x-rays or chest CT scans are the most common way to follow the nodule. Sometimes, lung PET scans may be done. If repeated x-rays show that the nodule size has not changed in 2 years, it is most likely benign and a biopsy is not needed.