Long-standing retroperitoneal schwannoma in a 36-year-old female: A case report.

Introduction: Schwannomas are encapsulated nerve sheath tumors derived from Schwann cells, primarily found in the head, neck, and extremities. Retroperitoneal schwannomas are rare and typically asymptomatic.

Case Presentation: A 36-year-old female presented with a long-standing, asymptomatic right lower abdominal mass.