Ultrasound diagnosis and follow-up of Takayasu arteritis with femoral vein involvement.

Takayasu arteritis (TA) is a form of chronic vasculitis that mainly affects the aorta and its main branches, most commonly in young female patients. The pathogenesis of the disease remains unclear, and the clinical manifestations are nonspecific. Therefore, misdiagnosis of the disease is considered to be common. Moreover, to the best of our knowledge, TA affecting veins has not been reported. Here we report a case of an adolescent with TA affecting the femoral vein as diagnosed by ultrasound.