Presentation
Turner syndrome.
Patient Data
Bilateral brachymetacarpia of the fourth ray. The phalanges are typically not hypoplastic. There’s also rhizarthrosis with loss of joint space, sclerosis and subchondral cyst between the base of the first metacarpal and the trapezium.
Positive metacarpal sign: yellow line tangent to the head of fourth metacarpal intercepts the third metacarpal.
Case Discussion
Brachymetacarpia most commonly affects the fourth finger. Brachymetacarpia is caused when the growth plate of the metacarpal closes early, resulting in premature stoppage of growth. This can be a congenital condition or can be an acquired deformity following trauma, infection, tumor, radiation, or prior surgery.
Radiographer: TSRM Fabio Imola