Giant cell tumour of the tendon sheath in the foot
Giant cell tumour of the tendon sheath (GCT-TS) has been described as the most common tumour of the hand following ganglion cysts. In contrast it is much rarer in the foot, with only 3-10% of GCT-TS being described in the foot. It is an uncommon condition, but should be considered as part of a differential diagnosis for a mass in the foot.

Published in the South African Orthopaedic Journal, the authors present the case of a 42-year-old male who presented with a large painful mass in in the third web space of his left foot, which was 7 cm in length in vivo.

It crossed the anatomical compartments of the forefoot and midfoot. This case report showed the typical findings of a GCT-TS.

A 42-year-old male presented with a painful mass in the third web space of his left foot. It was a slow-growing mass, which was first noticed many years earlier. Approximately 12 years prior to presentation, a biopsy was performed from the dorsal aspect of the foot at a peripheral hospital.

No clinical notes or histology results were available to us. At the time of presentation to our unit, the patient complained that the mass had increased in size considerably over the last year, and he felt as if he was walking on a stone. Despite the use of orthotics and shoe-wear modifications, he was experiencing a lot of pain on weight bearing and he complained of numbness in the third and fourth toes.

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