Isolated rupture of the accessory soleus tendon: an original and confusing picture
The accessory soleus muscle is an uncommon congenital anatomical variant with a prevalence ranging from 0.7 to 5.5%. Although intermittent and exertional symptoms caused by this supernumerary muscle have been well documented, acute injuries have not. We present a case of an isolated rupture of the accessory soleus tendon with myotendinous retraction, mimicking clinically a “tennis leg.” A 29-year-old woman sustained a hyperdorsal flexion injury of the right ankle with a severe and sudden pain in the middle part of the calf. Radiographs were normal and the diagnosis of “tennis leg” was clinically suspected. Ultrasound demonstrated bilateral accessory soleus muscles. On the symptomatic side, there was a complete isolated rupture of the accessory soleus tendon with myotendinous retraction. These findings were confirmed by magnetic resonance imaging (MRI), which showed no other abnormality. To our knowledge, this acute and misleading presentation has not been reported previously.
KeywordsAccessory soleus muscle Ultrasound Magnetic resonance imaging Tendon rupture Ankle Tennis leg
The authors would like to thank Dr Philippe Meyer for his contribution and expertise and Mrs Sandi Dincki for assisting with the editing of this manuscript.
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Conflicts of interest
The authors declare that they have no conflicts of interest.
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