Peter Lombard's Theology of the East

Peter lombard got hold of a latin translation that deals with mary in john damisene's language. And he seems to say that mary was purified of something at the moment of the enunciation. What does it mean? This is outside of its cultural context. Nobody's ever had access to this literature before. It's like the cutting edge theology of the east that has finally been translated in ten forty five a d. Now she's purified in udero. That would mean that he's actually gone against the university bad catecetical text book. I his angelic salutation, if we consider that more mature work. If that's his more mature