Erroneous intra-articular injection of gadolinium solution at 0.5 mol/l concentration: a case report.

Magnetic Resonance arthrography is considered the gold standard imaging technique for the study of shoulder instability and tendon tears.We describe an image artefact, characterized by decreased signal intensity of the paramagnetic gadolinium chelate contrast agent during a shoulder Magnetic Resonance arthrography, attributable to an incorrect concentration which does not cause evident capsular damage and is completely absorbed after 48 h from the administration.