29th September 2020

The presence of which feature on x-ray is an indication to consider starting anti-TNF-α monoclonal antibody therapies

The presence of which feature on x-ray in a patient with Ankylosing Spondylitis is an indication to consider starting anti-TNF-α monoclonal antibody therapies such as etanercept or adalimumab? 

Select the SINGLE most appropriate option from the list above.