@godfather2- Please do not be alarmed. Ground glass is a description of cell change. When it is tiny like yours is, as the radiologist says, "it is likely benign." Ground Glass doesn't necessarily mean cancer. If the radiologist suspected cancer a biopsy ordered would probably be performed. Your GG is LESS than a less (sub) half-inch.

I have lung cancer and have several GG. It is a particular kind of lung cancer. If they grow more than a certain amount then they are considered cancer.

What type of doctor ordered your CT scan?