Work

Classic Ewing Sarcoma of the Ankle With Ewing Sarcoma RNA-Binding Protein 1-Friend Leukemia Integration 1 (EWSR1/FLI1) Fusion: A Case Report and Review of Diagnostic Considerations

Year: 2026

Type: article

Abstract: Ewing sarcoma (ES) is a malignant small round blue cell tumor most frequently arising in the long bones of adolescents and young adults, characterized by a translocation involving the Ewing sarcoma RNA-binding protein 1 (EWSR1) gene, most commonly the EWSR1/friend leukemia integration 1 (FLI1) fusion. We report a case of a 26-year-old man with left ankle pain found to have an extraosseous soft tissue mass surrounding the calcaneus. Histopathology revealed a highly cellular neoplasm of uniform small round blue cells arranged in sheets and nests, immunoreactive for cluster of differentiation 99 (CD99) with diffuse membranous staining and negative for AE1/AE3, desmin, CD45, and S100. Targeted next-generation sequencing confirmed an EWSR1/FLI1 fusion, establishing the diagnosis of ES.

Source: Cureus

DOI: 10.7759/cureus.101021

Authors: Yanina Nikolaus, Gabriel Urbelz

Institution: Marshall University

Language: English

Topic: Sarcoma Diagnosis and Treatment

Subfield: Pulmonary and Respiratory Medicine

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: diamond

OpenAlex ID: W7118447633