Related Experiment Video
Updated: Jul 30, 2026

An Orthotopic Bladder Tumor Model and the Evaluation of Intravesical saRNA Treatment
Published on: July 28, 2012
Primary Visceral Ewing Sarcoma (Gastric and Bladder) with KIT Expression: A Report of Two Patients and a Differential
Anas Chaachou-Charradi1,2, Silvia Bagué3, Carmen Medina Medina1
1Pathology Department, Hospital Arnau de Vilanova, Valencia, Spain.
Abstract:
Extra-skeletal Ewing sarcoma is a rare tumor, most commonly occurring in the paravertebral region, extremities, retroperitoneum, and very rarely in visceral locations. We present two primary visceral Ewing sarcomas confirmed at the molecular level: one located in the stomach and the other in the bladder. Both tumors demonstrated strong and diffuse membranous CD99 expression, accompanied by variable KIT immunoreactivity. Additionally, we provide a review of the literature on primary gastric and bladder ES, including an analysis of differential diagnoses for gastric and bladder tumors exhibiting CD99 and KIT expression.
More Related Videos
06:12Evaluation of the Efficacy of the H. pylori Protein HP-NAP as a Therapeutic Tool for Treatment of Bladder Cancer in an Orthotopic Murine Model
Published on: May 29, 2015
06:43Robotic Duodenal Sleeve Resection for Gastrointestinal Stromal Tumor with Rare Exon 8 KIT Mutation Following Neoadjuvant Imatinib
Published on: April 3, 2026