I just found some information about a kid in China born with 31 digits (probably because of a genetic mutation) getting an operation to get rid of some of them. He had 15 fingers and 16 toes. Three fingers on each hand appear to be fused together and he doesn't seem to have thumbs.
Here are some pictures from before and after the operation:
Source here: http://portalwiedzy.onet.pl/146185,1,1,0,galeria_media.html . I couldn't find the English version, but it's mostly pictures anyway.