Inclusion Criteria:  Ground-glass pulmonary nodules found by CT scan Plan to accept surgery or puncture due to the pulmonary nodules Absence of treatment such as chemotherapy or radiotherapy and biopsy Adequate renal function to tolerate intravenous gadolinium Agree to sign informed consent Able to lie still during DCE-MRI  Exclusion Criteria:  Fail to understand or agree to sign informed consent Implanted pacemaker or cardiac defibrillator Contraindications to undergoing MRI Uncontrolled intercurrent illness Pregnant or breastfeeding