Hi ss, Thanks for visiting HCM. It must not be glass . Correct term is ground glass opacity, which usually is halfway between full consolidation and normal lung. It usually denotes pulmonary infections like tuberculosis. But can occur in lung edema, lung haemorrhages, lung fibrosis. I wish you must have told about the preceding symptoms like cough, shortness of breath, bloody sputum, loss of weight etc. Ground glass means the disease is at the stage when it be cured. So don t be panic and meet a good pulmonologist in your area to clinically correlate the CT scan findings and come to a diagnosis. In the meantime you may go for Sputum examination for acid fast bacilli done which is available at designated microscopy centres free of cost.. Best wishes