tibial nerve schwannoma

MRI imaging

of soft tissue tumours of the foot and ankle. Schwannoma. a Coronal T1W image demonstrating a well-defined homogeneously T1 isointense lesion with the split fat sign (arrows). b Coronal T2FS image of another schwannoma showing a homogeneously hyperintense lesion with a “ball on a string” sign denoting origin from the posterior tibial nerve (arrow). c The same lesion demonstrates avid enhancement on the post-contrast T1FS image