Tehran University of Medical Sciences Journal of Orthopedic and Spine Trauma 2538-2330 9 4 2023 12 30 195 7 Afshin Taheriazam Associate Professor, Department of Orthopedic Surgery, Farhikhtegan Hospital, School of Medicine, Islamic Azad University of Medical Sciences, Tehran, Iran Reza Mohammadnejad Resident, Department of Orthopedic Surgery, Firoozgar Hospital, School of Medicine, Iran University of Medical Sciences, Tehran, Iran Salar Baghbani 3 Resident, Department of Orthopedic Surgery, Sina Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Fatemeh Jabalameli Medical Student, Department of Orthopedic Surgery, Farhikhtegan Hospital, School of Medicine, Islamic Azad University of Medical Sciences, Tehran, Iran 2022 12 18 2023 12 30 Background: Giant cell tumor (GCT) is a benign aggressive bone tumor that occurs mostly in young adult patients after puberty. The most common location is around the knee joint. Occurrence in pre-puberty pediatric patients is very rare and accounts for 1.8% to 10% of all known GCTs. Case Report: Here, we report an eight-year-old boy who complained of pain and loss of range of motion (ROM) in the right hip. Radiological and pathological studies revealed GCT of the femoral head with joint expansion. We treated the patient by wide resection and osteochondral allograft reconstruction. Conclusion: We believe this is the first reported case of GCT in the proximal femoral bone of pediatric patients, which is proven by pathology. Studying the current case may help tumor surgeons to become aware of this possibility. https://jost.tums.ac.ir/index.php/jost/article/view/448 https://jost.tums.ac.ir/index.php/jost/article/download/448/344