Behind the Peritoneum and Back of the Mind: Consideration of Retroperitoneal Sarcomas as a Differential Diagnosis

Retroperitoneal sarcomas (RPS) are rare malignant tumours that originate from connective tissues of skeletal or extraskeletal origin in the retroperitoneal region, which are often missed. This case report highlights a patient with RPS that presented with abdominal swelling. In addition, this case report was written to elucidate the significance of thorough history, physical examination findings, and awareness in considering RPS as a differential diagnosis of abdominal masses in accurately diagnosing RPS for timely intervention.