MRI
Coronal PD fat sat
Coronal T1
Axial T2 fat sat
Sagittal STIR
Sagittal T1 C+ fat sat
Axial T1 C+ fat sat
Tented lobulated, well-circumscribed cystic lesion seen at the dorsal aspect of the left radiocarpal junction. It is situated within the deep subcutaneous fat region, overlying the fascia of sheath of extensor retinaculum, and forming subtle "comet tail" and" "claw sign" with the sheath of the extensor digitorum tendons.
There is associated mild tenosynovitis of the third extensor compartment just at this level.
Post gadolinium, there is thin enhancement at the periphery, but not within, which may signify mild inflammation. There is no associated solid or nodular component. The structure is seen overlying one of the small branches off the radial artery dorsally, but there is no associated ectatic feeding or draining in relation to this lesion.
There are T2 hypointense foci within the lesion, nonspecific, and could represent tiny calcifications.