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Takayasu arteritis miss-diagnosed as thoracic outlet syndrome: A case report

Background: Takayasu Arteritis (TA) is an idiopathic inflammatory vasculitis of unknown etiology that mainly 
 involves the aorta and its major branches. In this study, we reported the case of a female patient with unilateral 
 hand weakness that was initially misdiagnosed as TOS. However, at her most recent admission, the absence of 
 radial pulse was noted which eventually led to the diagnosis of TA. Rarity of the disease, non-specific presentation 
 and the absence of specific biochemical marker for TA made its early diagnosis difficult. We have tried to highlight 
 the importance of conducting a thorough the physical examination when visiting patients with weakness, as well 
 as the importance of considering rare differential diagnoses including TA in patients with unilateral limb paresis. 
 TA might not manifest its typical constitutional symptoms preceding vessel involvement. Therefore, a thorough 
 clinical examination is pivotal in differentiating TA and TOS.