Retinacular thickening involving both tendons of the 1st extensor compartment on ultrasound in a patient with nontraumatic radial-sided wrist pain suggests the diagnosis of De Quervain tenosynovitis. An intertendinous septum is present which is one of the anatomical variants 1.
The presence of a focal radial styloid abnormality on x-ray is an indicator of de Quervain tenosynovitis of the wrist 2. However, such abnormalities do not affect the outcome of the management 3.