J Radiol
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At sonography, peripheral nerves have a fibrillar appearance, that is tape-like on longitudinal scans and ovoid on transverse scans. Nerves are composed by hypoechoic fascicules within a hyperechoic environment. ⋯ The purpose of this general review is to present, as clearly as possible, in two parts, the sonographic features of normal and pathological nerves of upper and lower limbs. This first part will discuss nerves of the upper limb.