Findings, case of 26-year-old woman, right arm mass

Imaging Findings

Coronal STIR images (fat saturated T2) show a multiloculated mass in the medial forearm. It is not clear which muscle group is involved. The mass does not seem to be abutting the cortex of the bone. Foci of high T2 signal within the mass suggest either a high fluid content (myxoid) or cystic structure. T2-weighted axial images indicate that the lesion is a single mass arising from the anterior compartment. Bone involvement is still not clear. Fat saturated T1-weighted axial images demonstrate faint peripheral enhancement following contrast administration and seem to indicate involvement of the bone. Cortical breakthrough is not clear.

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