My 2yr old has a limp, fever, loss of appetite; what it be?

[michiganitis]

On Friday, me precious 24 month old started limping and came down with a 101+ fever at the same time. Next day, her limping got worse, fever for worse, and her appetite went way down. Plus she was much less active (makes sense). Folks her to ER. And we've been here ever since. They've done x-rays, ultrasounds, urine sample, nose swab, blood work on Sat and Sun. Plus tons of physical and gait exams. We now have a MRI and lumbar puncture scheduled for today (Mon).

They say it doesn't quite fit leukemia, synovitus, infection, guillaim-barre, or anything they can think of yet. I'm a emotional wreck. Is this is bad as I fear? Anyone have similar experience where it didn't initially seem like the most obvious cause of fever and limp?

[Donna3300]

One time my sick daughter got up to go to school and her legs crumbled under her she could not walk at all! I was terrified! I understand what you are going through!! My daughter was 5yrs old the Dr told me sometimes a virus can go to your legs and they can be so weak that they can't walk it cleared up a few days later. I pray your tiny lil one is ok!

[Gemfly]

No my kids did not have this. I hope they diagnose her soon. There's nothing worse than having a sick child. You're in my thoughts.

Blood tests also can detect signs of infection associated with septic arthritis but not toxic synovitis.

Septic arthritis/osteomyelitis
Lyme disease
Cellulitis
Perthes' disease (doesn't cause fever) rare