Hi,i m kayshel, 25 years old. I m not a smoker. I have my recently chest x-ray it saids there is an ovoid calcific density overlying the 4th anterior rib. Heart is not enlarged. Diaphragm and sulci are intact. Impression: bone island versus pulmonary granuloma,left. What does it mean?is it dangerous and needs to worry? Thank you in advance.

Summarized question: What is pulmonary granuloma?