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Sonographic target sign in neurofibromas.
Author(s) -
Lin J,
Jacobson J A,
Hayes C W
Publication year - 1999
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.1999.18.7.513
Subject(s) - medicine , sign (mathematics) , library science , family medicine , computer science , mathematics , mathematical analysis
Neurofibromas are the most common tumors of the peripheral nerves. They may be solitary lesions, multiple localized lesions, or large plexiform masses often associated with neurofibromatosis. Relatively few reports discuss the sonographic features of PNST, specifically neurofibromas.1–7 The typical sonographic description is that of a well defined, homogeneous hypoechoic lesion, which can show posterior acoustic enhancement mimicking a cystic lesion.1,3,4 We present a case of neurofibromatosis in a 19 year old man, which was initially diagnosed by ultrasonography. We describe the ultrasonographic findings that we believe correspond to the so-called target sign on T2-weighted MR imaging examinations. The appearance on T2-weighted MR images is reported as increased signal intensity peripherally and decreased signal intensity centrally.8–10 A target sign appearance was seen sonographically in numerous lesions, demonstrating a hyperechoic central region and a hypoechoic periphery.