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The diffuse bulge pointed by the patient is a muscle with normal echopattern; located between Achilles tendon and flexure hallucis longus tendon and replaces the pre-Achilles fat pad. It shows continuity with the soleus muscle cranially. There is an aponeurosis in posterior most part of the above-mentioned muscle which forms a very short tendon which is inserted into the upper border of the calcaneum, medial to the Achilles tendon insertion.
The Achilles tendon is normal. Flexure hallucis longus tendon is normal. Adjacent neurovascular bundle is normal.
Comparison with the asymptomatic side does not show accessory muscle.