Tarsal tunnel syndrome caused by talocalcaneal coalition
Introduction
Tarsal tunnel syndrome is a compressive neuropathy of posterior tibial nerve over the tarsal tunnel of foot. Various etiologies have been identified. Tarsal coalition as the cause of tarsal tunnel syndrome is uncommon. We presented the ultrasonography (US) and magnetic resonance imaging (MRI) findings of this disease. This is, to our knowledge, the first case report describing the US findings in tarsal tunnel syndrome caused by talocalcaneal coalition. We recommend the use of ultrasound as a screening test for tarsal tunnel syndrome to detect any space-occupying lesion.
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Case report
A 52-year-old woman presented with insidious onset of left medial ankle pain and numbness over forefoot for 3 years. There was no history of trauma before the onset of symptoms. The numbness was felt over the medial and plantar aspect of forefoot. The symptoms were mild at rest, which increased on prolonged walking. Upon physical examination, there were bilateral flexible feet with hindfoot valgus over the left side. The subtalar joint motion was limited. There was a small, localized, bony,
Discussion
Tarsal tunnel syndrome is a compression neuropathy of the posterior tibial nerve or one of its branches over the tarsal tunnel. The tarsal tunnel is a fibro-osseous channel that extends from the medial aspect of ankle to the mid foot, through which the medial tendons and posterior tibial neurovascular bundle pass. The fibro-osseous tunnel was bounded by the flexor retinaculum superficially; the medial surface of the talus, sustentaculum tali, and the medial clacaneal wall laterally; and the
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