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. 2012 May;46(3):321-5.
doi: 10.4103/0019-5413.96390.

MRI and ultrasonography in Morton's neuroma: Diagnostic accuracy and correlation

R Torres-Claramunt  1 , A Ginés, G Pidemunt, Ll Puig, S de Zabala
Affiliations

MRI and ultrasonography in Morton's neuroma: Diagnostic accuracy and correlation

R Torres-Claramunt et al. Indian J Orthop. 2012 May.

Abstract

Background: The diagnosis of Morton's neuroma is based primarily on clinical findings. Ultrasonography (US) and magnetic resonance image (MRI) studies are considered complementary diagnostic techniques. The aim of this study was to establish the correlation and sensitivity of both techniques used to diagnose Morton's neuroma.

Materials and methods: Thirty seven patients (43 intermetatarsal spaces) with Morton's neuroma operated were retrospectively reviewed. In all cases MRI or ultrasound was performed to complement clinical diagnosis of Morton's neuroma. In all cases, a histopathological examination confirmed the diagnosis. Estimates of sensitivity were made and correlation (kappa statistics) was assessed for both techniques.

Results: Twenty seven women and 10 men participated with a mean age of 60 years. Double lesions presented in six patients. The second intermetatarsal space was affected in 10 patients and the third in 33 patients. An MRI was performed in 41 cases and a US in 23 cases. In 21 patients, both an MRI and a US were performed. With regard to the 41 MRIs performed, 34 were positive for Morton's neuroma and 7 were negative. MRI sensitivity was 82.9% [95% confidence interval (CI): 0.679-0.929]. Thirteen out of 23 US performed were positive and 10 US were negative. US sensitivity was 56.5% (95% CI: 0.345-0.768). Relative to the 21 patients on whom both techniques were carried out, the agreement between both techniques was poor (kappa statistics 0.31).

Conclusion: Although ancillary studies may be required to confirm the clinical diagnosis in some cases, they are probably not necessary for the diagnosis of Morton's neuroma. MRI had a higher sensitivity than US and should be considered the technique of choice in those cases. However, a negative result does not exclude the diagnosis (false negative 17%).

Keywords: Correlation; MRI; Morton; neuroma; ultrasonography.

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Conflict of interest statement

Conflict of Interest: None.

Figures

Figure 1
Figure 1
Transverse T1-weighted MRI image reveals Morton's neuroma in the third interdigital space. A well demarcated low/intermediate signal intensity mass is shown. The Morton's neuroma is seen circled in red
Figure 2
Figure 2
Transverse T2-weighted MRI image shows low signal intensity mass in the same space. The Morton's neuroma is seen circled in red
See this image and copyright information in PMC

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