How do you approach SRS reirradiation for brain metastases overlapping previous sites of SRS?

This situation has several variants.

First of all its incidence should be about 5% in most SRS cases.

Second all retreatment decisions should be made following co-registration of current images with treatment images. Easy to be tricked based on scan angle.

Variant 1: Response followed by recurrence ...

This is not a common scenario, ie a new brain metastases so adjacent that there is overlap with a previously SRSed lesion. But if I am sure it is separate but beside a previously treated lesion, I would probably do SRS with usual dose. More commonly, there is an increase in size of the previously tr...