If an aneurysmal bone cyst is left untreated or diagnosed late, it can cause significant destruction to the affected bone and spread to surrounding soft tissues, making its treatment extremely challenging or nearly impossible. This cyst is generally considered a benign but locally aggressive bone tumor. However, it has the potential to severely weaken the affected bone and can be mistaken for certain malignant tumors, such as telangiectatic osteosarcoma. With a high risk of recurrence even after surgical intervention, this tumor requires a thorough evaluation and the application of the most appropriate treatment plan.