Do you have a size criteria when treating lung oligometastases with SBRT?  

A lesion 3-5 mm is difficult to characterize on PET, low yield for a biopsy, and non-specific, even if it developed in interval scans. Multiple 3-5 mm lesions could also be from an infectious/inflammatory condition. If the lesions are likely from cancer (i.e. new lesions with rising tumor markers, o...

I would not treat newly noted 3-5 mm lesions upfront with SBRT given uncertainty as to whether these truly represent malignancy (in a patient without a cancer diagnosis), metastasis (if no prior diagnosis of metastasis), or whether these are truly oligometastatic lesions (in a patient with a known p...

I agree with the above.  You need to first confirm that these small lesions are in fact malignant and not some other process.  If you cannot confirm malignancy then you should not be treating. If these are truly lung metastases, as mention above, there are some approaches that can be used...

I think Dr Milano’s answer is good advice! Albert Wiley MD PhD FACR, US Navy Retired , Emeritus Prof / U of Wisc-