Question RE frequency of CT scans - 5 mm ground glass nodule - 1289512

Hi all, I'm new to the forum so bear with me!

Last spring, my PFT that showed a mild restriction with normal diffusion. I have Sjogren's Syndrome and doctor assumed interstitial lung disease and referred me for high-res CT scan and follow up with pulmonologist.

CT scan came back with pattern of multiple nodules with random distribution, but also noted three separate nodules - 5 mm in righter lower lobe, 4 mm in right upper lobe, and 5 mm in left lower lobe and radiologist suggested "follow up would be prudent to exclude neoplasm"

Meantime, I had an opportunity to finally get into MGH. I followed up with pulmonologist there, who recommended a repeat scan at what would be 4 months from original CT scan.

Repeat scan (with barium) showed nodules still there and suggested sarcoidosis. Other nodules remained "stable" and radiologist recommended transbronchial biopsy.

Pulmonologist said that the 5 mm nodule was actually a subsolid ground glass nodule, which is not mentioned in either report. He said he is not ruling out sarcoidosis, but also said possible LIP - Lymphocytic interstitial pneumonia - and, of course, keeping a watchful eye for cancer. He said it's too soon to biopsy and that I shouldn't be worried about anything. But, he did schedule me for another ct scan in just 6 months.

Of course, I did some more research online when I got home. I can't find anything supporting ct scan at 4 months and again in another 6 months. Everything I have read says that if the nodule is stable and at 5 mm, another ct scan should be performed in a year. But, then again, it's difficult to get a lot of information RE subsolid protocol esp. nodules at exactly 5 mm.

It would seem to me that there are other tests beside CT scan if concern is headed to sarcoidosis or LIP...? Would these three nodules be considered "solitary" nodules, even in the presence of other pattern? Is six months appropriate time frame for another CT? What other questions should I be asking?

Thank you!