Giant Cell Tumor of Thumb Proximal Phalanx-A Case Report

INTRODUCTION: The prevalence of giant cell tumor (GCT) of bone is approximately 5% of all primary osseous tumors. It accounts for <2% of the total cases as far as the involvement of the hand is concerned. Numerous studies stated that <1% of cases have phalangeal involvement of the thumb. CASE REPORT: This case is delineated for its unusual location (thumb proximal phalanx) in a 42-year-old male patient managed by single-stage en-bloc excision, arthrodesis, and web-space deepening procedure without donor-site morbidity. It is known for its notorious nature for reoccurrence (10–50%) and transformation into malignancy (10%); therefore, meticulous dissection is a prerequisite. CONCLUSION: GCT of the thumb proximal phalanx is quite an unusual presentation. Although very rare, it is thought to be one of the most aggressive varieties of benign bone tumor observed to date. Amid a high rate of recurrence, careful preoperative planning is pivotal for fruitful outcome both anatomically and functionally.