I need to devise a protocol for quantifying micro- and macro-metastases in murine lungs. We have several lungs stored in the deep freeze in OCT ready for cryosectioning. Is it possible to retroactively fixate these in Bouin's solution to provide contrast for surface metastases, then refreeze for cryosectioning and H&E stain to visualize micrometastases? Alternatively, is it possible to achieve the staining effects of Bouin's solution on frozen tissue either pre- or post-sectioning?
There are a lot of questions wrapped up in this, so please, any insight you have, do share! Also, if you have any references to provide for further reading, that would be much appreciated.