School ager with left calf pain and eosinophillia

MRI of myositis of the calf
Axial STIR MRI of the calves (above) shows diffusely bright signal in the expanded and edematous muscles in the posterior compartment of the left calf. Sagittal STIR MRI of the left calf (below) shows the length of involvement throughout the entire posterior compartment of the left calf.

The diagnosis was myositis most likely due to a parasitic infection.