open access

Vol 45, No 6 (2011)
ARTYKUŁ ORYGINALNY
Submitted: 2011-04-13
Get Citation

Sonographic diagnosis of carpal tunnel syndrome — diagnostic value of the triangular cross-section sign

Kazimierz Szopiński, Teresa Mazurczak-Pluta
DOI: 10.1016/S0028-3843(14)60122-5
·
Neurol Neurochir Pol 2011;45(6):556-560.

open access

Vol 45, No 6 (2011)
ARTYKUŁ ORYGINALNY
Submitted: 2011-04-13

Abstract

Background and purpose

Carpal tunnel syndrome (CTS) is a common neuropathy resulting from compression of the median nerve at the carpal tunnel. Sonographic diagnosis of this condition relies on enlargement, flattening and/or demonstration of impaired mobility of the median nerve, as well as bowing or thickening of the flexor retinaculum. In most patients the cross-section of the median nerve at the level of the carpal tunnel has an oval or elliptical shape. We have noticed, however, that in a number of cases the cross-section of the median nerve at the inlet of the carpal canal was deformed, assuming a triangular shape. The purpose of this study was to assess the diagnostic value of the triangular median nerve cross-section sign.

Material and methods

One hundred and thirty-nine sonographic examinations in 76 patients with clinical signs of CTS, and 25 examinations in 14 healthy volunteers were performed. Standard electrodiagnostic studies were performed in all symptomatic patients.

Results

Triangular shape of the median nerve cross-section in the carpal canal was observed in 13/118 (11.0%) median nerves with abnormal result of the electrodiagnostic study, and in 2/21 (9.5%) cases with a normal electrodiagnostic examination result. No such deformation was seen in the control group.

Conclusions

The triangular cross-section sign has high specificity (0.90) and positive predictive value (0.87) in diagnosis of CTS.

Abstract

Background and purpose

Carpal tunnel syndrome (CTS) is a common neuropathy resulting from compression of the median nerve at the carpal tunnel. Sonographic diagnosis of this condition relies on enlargement, flattening and/or demonstration of impaired mobility of the median nerve, as well as bowing or thickening of the flexor retinaculum. In most patients the cross-section of the median nerve at the level of the carpal tunnel has an oval or elliptical shape. We have noticed, however, that in a number of cases the cross-section of the median nerve at the inlet of the carpal canal was deformed, assuming a triangular shape. The purpose of this study was to assess the diagnostic value of the triangular median nerve cross-section sign.

Material and methods

One hundred and thirty-nine sonographic examinations in 76 patients with clinical signs of CTS, and 25 examinations in 14 healthy volunteers were performed. Standard electrodiagnostic studies were performed in all symptomatic patients.

Results

Triangular shape of the median nerve cross-section in the carpal canal was observed in 13/118 (11.0%) median nerves with abnormal result of the electrodiagnostic study, and in 2/21 (9.5%) cases with a normal electrodiagnostic examination result. No such deformation was seen in the control group.

Conclusions

The triangular cross-section sign has high specificity (0.90) and positive predictive value (0.87) in diagnosis of CTS.

Get Citation

Keywords

carpal tunnel syndrome, ultrasound, median nerve

About this article
Title

Sonographic diagnosis of carpal tunnel syndrome — diagnostic value of the triangular cross-section sign

Journal

Neurologia i Neurochirurgia Polska

Issue

Vol 45, No 6 (2011)

Pages

556-560

DOI

10.1016/S0028-3843(14)60122-5

Bibliographic record

Neurol Neurochir Pol 2011;45(6):556-560.

Keywords

carpal tunnel syndrome
ultrasound
median nerve

Authors

Kazimierz Szopiński
Teresa Mazurczak-Pluta

Important: This website uses cookies. More >>

The cookies allow us to identify your computer and find out details about your last visit. They remembering whether you've visited the site before, so that you remain logged in - or to help us work out how many new website visitors we get each month. Most internet browsers accept cookies automatically, but you can change the settings of your browser to erase cookies or prevent automatic acceptance if you prefer.

By "Via Medica sp. z o.o." sp.k., ul. Świętokrzyska 73, 80–180 Gdańsk, Poland
tel.:+48 58 320 94 94, fax:+48 58 320 94 60, e-mail: viamedica@viamedica.pl