Fibromatosis of the soleous muscle presenting as pes equinus

it is uncommon for soft tissue tumor to present as joint contracture as the first symptom. We report a case of a fibromatosis in soleus muscle presenting as pes equinus. The patient walked with a toe-walking gait pattern and the heel came off the floor about five centimeters. The dorsiflexion of the foot was limited to -50 degrees despite the knee position. A cord-like lesion was palpable from the mid-calf down to insertion of the Achilles tendon. T1- and T2-weighted magnetic resonance images showed a soft tissue lesion with the hypointense signal in her left soleus muscle. Partial resection of the proximal end of the tumor, in combination with adhesiolysis and Achilles tendon lengthening, was performed. Two years after the surgery there was no recurrence of pes equinus, although she experienced mild leg pain after long walks. Pathological assessment revealed the diagnosis as fibromatosis in the soleus muscle.

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