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Ultrasound facilitates the diagnosis of tarsal tunnel syndrome: intraneural ganglion cyst of the tibial nerve

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Abstract

The tibial nerve intraneural ganglion cyst—which presents with fluid accumulated inside the nerve epineurium—is a rare etiology of tarsal tunnel syndrome. We report a case with insidious onset of numbness over his left medial ankle. Ultrasound imaging revealed that the tibial nerve was encircled by crescent-shaped anechoic substances, spanning from the distal leg to the sole. Magnetic resonance imaging disclosed a thickened tibial nerve wrapped by hyperintense materials in the tarsal tunnel. Some effusion was observed besides the tibialis posterior and flexor digitorum tendons as well. The patient underwent a surgical treatment and an intraneural ganglion cyst was confirmed. This report elaborated the clinical and imaging presentations of a tibial nerve intraneural ganglion cyst and highlighted the usefulness of ultrasound in exploring the cause of compressive neuropathy at the ankle region.

Sommario

La cisti del ganglio intraneurale del nervo tibiale—che si presenta con presenza di liquido all’interno del nervo epineurico—è una rara causa di sindrome del tunnel tarsale. Segnaliamo un caso con insidiosa insorgenza di intorpidimento a livello della caviglia mediale sinistra. L’ecografia ha rivelato che il nervo tibiale era circondato da sostanze anecoiche a forma di mezzaluna, che si estendevano dalla gamba distalmente fino in zona plantare. La risonanza magnetica ha rivelato un nervo tibiale ispessito ed avvolto da materiali iperintensi nel tunnel tarsale. È stato osservato un certo versamento perifericamente ai tendini del tibiale posteriore e del flessore delle dita. La paziente è stata sottoposta a un trattamento chirurgico ed è stata confermata una cisti gangliare intraneurale. Questo caso clinico ha valutato le presentazioni cliniche e di imaging di una cisti del ganglio intraneurale del nervo tibiale e ha evidenziato l’utilità degli ultrasuoni nella valutazione della causa della neuropatia compressiva nella regione della caviglia.

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Correspondence to Ke-Vin Chang.

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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions.

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Wu, WT., Chang, KV. & Özçakar, L. Ultrasound facilitates the diagnosis of tarsal tunnel syndrome: intraneural ganglion cyst of the tibial nerve. J Ultrasound 22, 95–98 (2019). https://doi.org/10.1007/s40477-018-0314-5

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  • DOI: https://doi.org/10.1007/s40477-018-0314-5

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