MRI left thigh:
Coronal and axial sequences have been obtained.
Extensive gross muscular oedema and swelling is identified in the anterior compartment of the left thigh, involving almost the entirety of vastus medialis, and 70 - 80% of vastus lateralis and vastus intermedius. Rectus femoris is spared. A thin layer of fluid tracks along fascial planes between the anterior compartment musculature. No focal muscular or myotendinous junction tear. No signal abnormality identified in muscle bellies of the posterior or medial compartments of the left thigh. Incompletely imaged on the coronal sequence, there is evidence of less pronounced muscular oedema in the contralateral right vastus medialis. No mass lesion. No bone marrow oedema.
Conclusion: Appearance is consistent with exercise induced muscle oedema/injury.