Ring finger mass There is a lobulated mass within the radial and volar soft tissues of the ring finger. It measures approximately 2 x 1 cm in the craniocaudal and transverse dimensions and extends from the mid diaphysis of the middle phalanx to the base of the distal phalanx with a possible additional small component more distally at the level of the mid shaft of the distal phalanx. The mass abuts the lateral aspect of the flexor digitorum profundus tendon however the underlying tendon is normal. Additionally, the underlying bone is normal in signal without erosion. The mass is isointense to skeletal muscle on T1 sequences and contains tiny foci of increased signal best appreciated on the coronal T1 sequence. The mass is hyperintense to skeletal muscle on fat saturated T2 sequences with small round and curvilinear foci of low signal intensity. Following administration of gadolinium, there is heterogeneous enhancement. No additional masses are identified. The remaining visualized bone marrow signal is normal. A tiny cyst is seen within the head of the third metacarpal.
Subcutaneous mass of the ring finger as detailed above. The enhancement pattern is not consistent with that of a ganglion and the lobulated margin and signal characteristics may be reflective of a vascular anomaly such as a venous malformation. A tenosynovial giant cell tumor is also considered as a less likely option.