Discrepancy in numbers: A Source Pageviews All Visits B Filtered by segment URL is

We have been comparing numbers we get by looking
A) at pageviews through general “all visits” as compared to
B) Same URL filtered through a segment.

Numbers differ and we cannot find out why this is so.

A) 2983 2803 89% 00:00:45 91% 0.52s
B) 2893 2719 89% 00:00:44 91% 0.52s

Can anyone enlighten us on that question?

Thierry Spampinato
Web Services Universität Basel