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[A case of Takayasu arteritis diagnosed by magnetic resonance imaging].

We report a case of Takayasu arteritis. A woman, 24 years old, was admitted because of fever of unknown etiology. Infection was ruled out. Bruit and asymmetrical pulsation were not found. Ga-scintigram showed abnormal uptake in her upper abdomen. Abdominal echogram revealed neither evidence of abscess nor lymphadenopathy. On abdominal computed tomography, a wall thickening of the abdominal aorta was revealed. In addition, abdominal magnetic resonance imaging(MRI) showed a wall thickening and an enhanced image by gadrinium enhancement. Although we could not carry out conventional aortography because of an allergy to lidocaine, she was diagnosed as having Takayasu arteritis. In response to steroid therapy, the fever promptly dropped and the data indicating inflammation were improved. On the MRI examination after 40 days of steroid therapy, the wall thickening of the abdominal aorta was found to be less prominent. We conclude magnetic resonance imaging is useful for diagnosis and follow-up of early and acute stage of Takayasu arteritis.