# Ewing's Sarcoma Disguised as Aneurysmal Bone Cyst Lesion: About a Case

## TL;DR

A 13-year-old patient with a bone lesion initially diagnosed as benign later found to have Ewing's sarcoma, highlighting the need for biopsies in similar cases.

## Contribution

Highlights the importance of mandatory biopsies for suspicious aneurysmal bone cysts to avoid misdiagnosis.

## Key findings

- A case of Ewing's sarcoma misdiagnosed as an aneurysmal bone cyst was identified postoperatively.
- The patient's parents refused salvage treatment, leading to the patient's death within six months.
- Biopsies are essential for suspicious lesions, even with typical clinical and radiological features.

## Abstract

Aneurysmal bone cysts are defined as benign lesions. They expose the patients to a higher risk of pathological fractures. The typical clinical and radiological aspects of the tumor usually do not require a pathological confirmation before a definite treatment. However, in some cases, a malignant tumor will have the same clinical and radiological characteristics of a begin lesion. Our case highlights this fact. We present a case of a 13-year-old patient that presented to us with a pathological fracture. The X-ray and CT scan were in favor of ABC; however, the postoperative pathology revealed an Ewing sarcoma. A salvage treatment became mandatory after this finding but was refused by the parents, resulting in the death of the patient 6 months later. A biopsy must be mandatory each time we have a suspicious aneurysmal bone cyst even with typical clinical and radiological characteristics before starting a treatment plan.