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High‐resolution sonography of the peripheral nervous system – a review of the literature
Author(s) -
Beekman R.,
Visser L. H.
Publication year - 2004
Publication title -
european journal of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.881
H-Index - 124
eISSN - 1468-1331
pISSN - 1351-5101
DOI - 10.1111/j.1468-1331.2004.00773.x
Subject(s) - medicine , ulnar neuropathy , carpal tunnel syndrome , peripheral neuropathy , brachial plexus , peripheral , pathological , magnetic resonance neurography , ultrasonography , elbow , peripheral nerve , median nerve , anatomy , entrapment neuropathy , peripheral nervous system , humerus , ulnar nerve , radiology , pathology , central nervous system , magnetic resonance imaging , diabetes mellitus , endocrinology
High‐resolution sonography is capable of depicting peripheral nerves and the brachial plexus. In this study we review the literature on this subject. Normal peripheral nerves have a characteristic echotexture. Most nerves are readily visualized, although this is not always the case with the nerves of the lower extremity. The main pathological changes that can be demonstrated are nerve enlargement and increased hypoechogenicity. In order to demonstrate nerve enlargement, measurements should be performed and compared with a set of reference values. Several neuropathies have been studied by means of ultrasonography. However, many studies concern case reports and show methodological shortcomings. The best studied peripheral neuropathy is the carpal tunnel syndrome in which ultrasonography seems to have an additional value when combined with nerve conduction studies. Nerve enlargement has also been demonstrated in radial neuropathy at the humerus and in ulnar neuropathy at the elbow. The role of sonography in various hereditary and inflammatory neuropathies is uncertain although diffuse nerve thickening could be demonstrated. Further systematic studies are needed to determine the role of sonography in the diagnostic process of the various neuropathies. It would be important to study the subcategories of patients in whom electrodiagnostic studies are normal or show equivocal findings.