Lung SBRT Reirradiation

I've got a case of an 80yo F with good PS but non-operative candidate with a new stage I NSCLC within 1-2cm of a previously treated early stage NSCLC (50 Gy in 5 fractions in 2013). Original site shows no evidence of recurrence, and the lesion is clearly distinct from the old treatment site and with a spiculated appearance, so fairly convinced this is a new primary instead of a regional recurrence. The lesion is very peripheral (chest wall adjacent), so I am inclined to do another course... Lung SBRT Reirradiation
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