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The Target Sign: Extremity¹

¹ From the Department of Radiology, MCHE-DR, Brooke Army Medical Center, 3851 Roger Brooke Dr, Fort Sam Houston, TX 78234. Received June 20, 2003; revision requested August 29; revision received October 8; accepted November 12. Address correspondence to the author (e-mail: kevin.banks@cen.amedd.army.mil).

View larger version (115K): [in a new window]   Transverse T2-weighted MR image (2500/60 [repetition time msec/echo time msec]) with fat-suppression technique shows a benign peripheral nerve sheath tumor (PNST) arising from the tibial nerve. The lesion, which demonstrates the classic target sign, shows the characteristic central area of low signal intensity surrounded by a rim of high signal intensity (arrow), a finding that is typical of these neoplasms.