At its worst the bruise was more than 25cm top to bottom. We had been
sliding on the ice on a frozen stream. I tried to enter the river a little
too high and went through the top layer of ice. However, where I should
have entered the stream the ice was quite solid, and I slammed sideways
into that, with the above result. (I think I may have done some deeper
damage as well.)
Update: I got a beauty hematoma from it, which could still be felt as
a lump the next time I was in Romania,
and even much later as well.