Primary Extraosseous Ewing Sarcoma of Anterior Abdominal Wall

Abstract

Ewing’s sarcoma (ES) is the second most common malignant bone tumor in children and young adults. ES also occurs as a primary soft tissue neoplasm without involvement of bone. Usual sites of involvement are the deep soft tissues of the lower extremity and paravertebral region. Clinical or imaging findings are non-specific, and diagnosis is based on histology. We reported a rare case of an Extraosseous Ewing Sarcoma (EES) developed in the soft tissues of the anterior abdominal wall in midline position in a 63-year-old woman who presented with a painful abdominal mass. The case was suspected to be carcinoma ovary with pelvic deposits, however on laparotomy it was found to be a malignant anterior abdominal wall mass. The final diagnosis on immunohistochemical staining was EES.