• Common extensor origin enthesopathy - also seen in golfers.
• dominant arm in tennis players and leading arm in golfers
• mucinous degeneration and disorganisation involving the extensor carpii radialis brevis (ECRB).
• one third of cases also involve the extensor digitorum communis.
• Clinical features suggest diagnosis in most cases
• High signal on Coronal fluid sensitive sequences
• Intense vascularity can be misdiagnosed as partial tear.
• MRI can overcall partial tears actually due to neovascularity
• RCL involvement said to worsen prognosis
• Loss of tendon reflectivity on US typical
• Increased vascularity very common and useful to confirm diagnosis
• RCL represented by the deepest fibres
