What causes benign lung nodules?

What causes benign lung nodules?

There are many possible causes of benign lung tumors and nodules. These include:

• Granulomas (small clumps of inflamed cells) that develop as a result of a bacterial infection such as tuberculosis or from fungal infections such as histoplasmosis or coccidiomycosis.
• A lung abscess (pus-filled infection usually caused by bacteria).
• Inflammation from such diseases as rheumatoid arthritis, sarcoidosis or Wegener’s granulomatosis.
• Infection from human papilloma virus.
• Birth defects such as a lung cyst, scars, or other lung malformation.
• No known cause.