Dwarf won't move because of a goblin who's not there

In my current game of Dwarf Fortress I just had some injuries and deaths due to an ambush. Now I have a Fisherdwarf who is laying there unconscious and unattended. Every other tick I get an accouncement saying Urist McWounded cancels Rest, interrupted by Goblin Maceman. However there is no living, free Goblin on the map. How can I get my dwarf medical attention?

I had this happen to me yesterday. I channelled out the square underneath him and the downward motion seemed to trigger the correct "Damn I hurt, where's the hospital?" response.

At this point, I believe the only medical attention McWounded can afford to seek is euthanasia, dwarf-style. Kill him with magma.