Enlarged c1 transverse process?

[MrPhysio+]

Hi Anarion,
Interesting problem. The other posts are providing good feedback. If the child has only recently reported soreness then I suspect that she was born with a Left Right transverse process variability.
Such variations are not uncommon in the human body and can be completely assymptomatic until another minor injury / irritation draws attention to them. If the child has previously had full Cx range of movement (and I suspect this to be the case given no previous medical investigations) and the child is otherwise well, it would be best to advise mild heat (hot packs) and let the child get on with her life. Massage may just aggravate the problem and cause the child to 'play' to the problem, possibly creating a learned protective muscle splinting that will reduce range of movement. When the soft tissue soreness ceases then the parents can be taught how to have their daughter stretch the soft tissue - only if necessary.

Obviously I am assuming that scans are ruling out bone tumour - MRI or CT to be undertaken should plain x-ray be unhelpful.

Just my thoughts. Hope the info provokes further discussion.
MrPhysio+