I scanned this cystic lesion in a severely PUPD stray geriatric Staffie.  The only changes on bloods was elevated ALP.  It was drinking 6-9 litres/day.  The watery fluid that came out of this cystic lesion was acellular.  It had other liver masses and a very nodular spleen (hence was PTS'd and this was post mortem).  Has anyone seen anything like this before?  Benign or otherwise?  Related to PUPD???