Atypical Aneurysmal Bone Cyst of Humerus with Pathological Fracture Mimicking a Malignancy - A Case Report

We present a case of an atypical aneurysmal bone cyst (ABC) of the humerus in a 14-year-old male patient who presented with a pathological fracture.Initially suspected as a malignancy due to its aggressive radiological features, the diagnosis was challenging.Management of the fracture by closed intramedullary nailing followed by histopathological examination of the aspirate from the reamer confirmed the lesion as an atypical ABC.This case underscores the importance of considering atypical presentations of benign lesions in the differential diagnosis of bone tumors to avoid unnecessary aggressive treatments.