History: Painful and swollen right carpus.
Mild smooth new bone proliferation on the craniodistal and medial aspect of the right radius associated with the groove of the abductoris digiti I longi tendon (previously termed abductor pollicis longus tendon).
Mild right carpal swelling.
Radiographic Diagnosis :
These changes are consistent with stenosing tenosynovitis of abductoris digiti I longi tendon.
Other etiologies, such as a carpal soft tissue malignancy in the groove of this tendon, are very unlikely.
Hittmair KM, Groessl V, Mayrhofer E. RADIOGRAPHIC AND ULTRASONOGRAPHIC DIAGNOSIS OF STENOSING TENOSYNOVITIS OF THE ABDUCTOR POLLICIS LONGUS MUSCLE IN DOGS: Stenosing Tenosynovitis Abductor Pollicis Longus Muscle. Veterinary Radiology & Ultrasound. 2012 Mar;53:135–140.