Peritrochanteric Unicameral Bone Cyst in A 9-Year-Old Girl: A Case Report and Review of Literature

Introduction: the unicameral bone cyst (ubc) is a benign osteolytic lesion primarily found inthe metaphyseal part of long bones in children. it is important as it can involve growth plateinvolvement, cause pathological fractures and deformities of the affected limb. we report thiscase to emphasize that hip area pathologies can be represented with knee pain and discomfort.case presentation: the patient was a 9-year-old girl with a bone cyst in the right proximal femur,with functional knee pain and limping. the diagnosis was made after two years of pain in theknee area. as the cyst was symptomatic and the signs of impending pathological fracture wereseen, the lesion was managed by curettage and fibular strut allograft and proximal humeruslocking plate.conclusions: the patient has been examined for knee joint problems for a long time, and herfemur bone cyst was diagnosed after two years of pain. however, it could become a pathologicfracture or involve the growth plate and stop the limb’s growth, thus affecting the patient’squality of life. therefore, in children with chronic knee pain, careful assessment of the hip areais recommended.