Extraosseous Ewing's sarcoma of the pancreas.

We present the clinical case of a 21-year-old male with abdominal pain in the left hypochondrium radiating to the ipsilateral lumbar area and a weight loss of 2kg over a month, secondary to a large palpable intra-abdominal mass in the examination. TAC revealed a large solid mass with necrotic-cystic component which depended of the pancreas, infiltrated the spleen, enveloped the celiac trunk and affected to the splenic vases. Inmunohistochemical and molecular study confirmed the diagnosis extraosseus Ewing sarcoma (EES).