A Rare Case of Giant Cell Tumor of the Extensor Hallucis Longus Tendon

Abstract

Giant cell tumor is a benign tumour of the extremities that is more prevalent in the upper limbs and less common in the foot and ankle region. We present a case of a patient with a lobulated lesion on the dorsum of the foot that turned out to be a giant cell tumor of the extensor hallucis longus tendon sheath. The likelihood of treatment success is increased by doing a differential diagnosis of a "synovial cyst" in the foot and ankle, completing sufficient surgical planning, and using imaging tests such as nuclear magnetic resonance. Giant cell tumor of tendon sheath involving the foot and ankle region is a rare clinical entity, and good results can be expected after surgical excision