Giant cell tumor of the tendon sheath
Swelling at the right ring finger.
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Well defined lobulated soft tissue lesion is abutting the ventrolateral aspect of the flexor tendon sheaths of the ring finger opposite the proximal interphalangeal joint causing focal contour bulge.
It elicits persistent low signal at all pulse sequences.
It is also known as pigmented villonodular tumor of the tendon sheath (PVNTS) or extra-articular pigmented villonodular tumor of the tendon sheath.
Not surprisingly, given the histological similarity to PVNS, giant cell tumors of the tendon sheaths also share the same finding on MRI, mainly on account of hemosiderin accumulation.
Signal characteristics include
- low signal
- variable enhancement
- T2 - low signal