Round Cell Sarcoma: A Challenging Diagnosis.

Sarcomas are malignant tumors of mesenchymal origin that can occur throughout the body. Among these, undifferentiated round cell sarcomas are rare, aggressive tumors, often affecting young adults and presenting diagnostic challenges. We report the case of a 22-year-old female who presented with persistent chest pain and progressive respiratory distress. Despite extensive diagnostic efforts including imaging, thoracentesis, and exploratory laparoscopy, the diagnosis was delayed. Her condition deteriorated rapidly, culminating in sepsis, tumor lysis syndrome, and death. Post-mortem analysis confirmed a diagnosis of undifferentiated round cell sarcoma. This case illustrates the importance of considering rare malignancies in differential diagnoses and highlights the diagnostic and therapeutic challenges posed by these tumors.