Using LINQ to delete an element from a ObservableCollection Source [duplicate]

Actually, it is a closer duplicate of:
RemoveAll for ObservableCollections?

Possible Duplicate:
using LINQ to remove objects within a List

This is the code I’m using, but its not very readable. Can I use LINQ to shorten the code below while still having the same functionality?

int index = 0;
int pos = 0;

foreach (var x in HomeViewModel.RecentPatients)
   if (x.PID == p.PID)
       pos = index;