What is the role of imaging studies in the workup of granuloma annulare?

Updated: Oct 15, 2020
  • Author: Ruby Ghadially, MBChB, FRCP(C)Derm; Chief Editor: William D James, MD  more...
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Imaging studies are not generally necessary in diagnosing granuloma annulare. However, radiographs, CT scans, or MRIs may be helpful in the evaluation of atypical subcutaneous lesions.

Radiographs of subcutaneous granuloma annulare show a nonspecific soft tissue mass without calcification. On CT scans, subcutaneous granuloma annulare appears as a poorly defined mass with variable attenuation and variable contrast enhancement. On MRIs, subcutaneous granuloma annulare appears as a mass with poorly defined margins that is limited to subcutaneous tissue. MRI findings may be suggestive of, but not diagnostic of, subcutaneous granuloma annulare. [13, 14]

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