Which anatomic structures are usually affected by this condition?
The calcific deposits can be found in tendons, bursae, ligaments or the joint capsule, they might also migrate into the joint or less often into the bone.
Which specific structures are affected in this case?
The 3rd metacarpophalangeal joint with the ulnar joint capsule specifically the ulnar proper collateral ligament below the sagittal band. There is a second small osseous deposit affecting the dorsoulnar aspect of the 3rd metacarpal head.
Findings:
large periarticular low-intensity structure (approx. 12 x 6 x 3 mm) ulnar and dorsal at the level of the 3rd MCP joint below the extensor hood and ulnar sagittal band in the region of the ulnar proper collateral ligament with a distance of approximately 4 mm to the D3 extensor tendon
associated inflammatory changes in the joint capsule
osseous involvement of the dorsoulnar aspect to the 3rd metacarpal head with mild bone marrow oedema
intact extensor tendon
Impression:
Calcific deposit and associated inflammatory changes of the dorsoulnar aspect of the 3rd metacarpophalangeal joint.
Exam courtesy: Ines Lischka (radiographer)