Tibial nerve sheath tumor
Right leg pain at distal a third posterior aspect. No trauma.
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There is a well defined, rounded mass measuring about 8 x 12 mm arising 55 mm above the ankle joint in the course of the tibial nerve posteriorly.
The mass shows homogenous T1 hypo and heterogenous T2 hyperintensity and relatively homogenous avid contrast enhancement.
Appearance is consistent with a peripheral nerve sheath tumor of the tibial nerve.